Kt88 Bias Chart

Apart from Craig's octupler (x8) ruminations , I have been looking at an end -driven hextupler (x6) which makes a bias supply a conventional doddle. Power tubes: 6V6, 6K6, EL84, EL844, 6L6, 5881, EL34, KT66, KT77, KT88, KT120, 6550, 300B. Overall, I would rate the condition a solid 7 5 out of 10. com offered a set of five EL34-type tubes for review (JJ KT77; JJ EL34 II; Svetlana EL34; Genalex Gold Lion KT77 and Mullard EL34) I jumped at the opportunity. This will enable you to figure out the year your amp was made. At the time Philips had already developed and patented power pentode designs, which were rapidly replacing power triodes due to their greater efficiency. This is required in all "fixed bias" amps when new power tubes are introduced. It's the model with the sockets for 7, 9 and 10 pin miniatures, 5,6, and 7 pin subminatures,octals, loctals, and Compactrons. The low and medium gain sounds are balanced and spacious, while the clean tones can be pristine, chunky, crisp or edgy. With proper bias adjustment, KT66, KT88, 5881, 6L6, and 6550's can also be used. All original except bias supply capacitor Has tube chart date code OA (January 1965) and speaker date (465 515) Oxford, 15th week of 1965. An amp's bias is like a car's idle speed: it needs to be set correctly for the amp to operate efficiently, and an incorrect bias setting will also seriously impede your tone. We hope you enjoy unlocking your Blackstar Potential. My 6CA7 data sheet SE example shows 25W of plate dissipation @ 14v of bias. Tube rolling on a Cayin A-88T mk2. Tube Data Sheet Locator. Harp, or bass with a few mods OR use it for a PA or home audio amp. Buy, sell, and trade high end audio and Home Theater equipment. A full balance EQ section feeds a pair of ultra-linear connected KT88 power tubes. It is worth stressing that the KT88 and ECC83 tubes come from a reputable manufacturer, Electro-Harmonix. › kt88 bias chart › 6l6 tube bias chart › Weber bias rite › cathode bias calculator. We may have assigned "G" Price Codes to:. "G" (General Price Codes) items are typically side-stapled (most factory originals are this way) with fiber reinforced tape applied to spine. This is the very rare Mullard 10M series gold pin version of this audiophile tube. I think originally the manufacturers employed 807's. If you want to bump the bias up a little higher, you are welcome to do so but the amp won't really sound any better and tube life will go down. [email protected] (As shown on the picture). OPT6 for SE 1. Maybe not the top-of-the-charts manufacturer, but certainly one that is robust and perfectly maintains technical specifications. This suggests the 6AQ5 RF driver use in the Viking II is a pretty good choice. We have found the Surgical Steel to be a stellar pedal platform for 6 string guitar, as it's high headroom and near endless sustain offers the perfect canvas for a variety of effects pedal configurations. By Rob Robinette. Tube Type. We now have a modification to the Jolida JD-1000P power amplifier. es Networks Asia Global PTE. Turn on your power amp and let the tubes get warm (3-5 minutes) read the bias measurement. 5% total harmonic distortion. The KT88 is also suitable for use as a series tube in a stabilised power supply. Though simplicity was part of the design goal for this amplifier, this is not a beginner’s build. This calculator allows you to trace the anode characteristics graph, and to compute and tune loadline and operating point of various vacuum tubes. February 5, 2015. The 0 to 300V (x axis) scale, the 0 to 300mA (y axis) and the bias voltage legend to the right of the chart are generated automatically by Open Office or Excel. divide this by the plate voltage of 400. We agreed that I'd throw a few of my own tubes, including the Tung-Sol EL34B and. A pair of KT88 output tubes per channel provides a modest power output of about 45Wpc. Fully assembled and ready to use. ADJUSTING THE OUTPUT TUBE BIAS The front panel incorporates a bias meter. When Jon Esau of www. 8k : 5 ohms with 44T x 50S core, all details. Enter values in blue and click any Calculate button. com offered a set of five EL34-type tubes for review (JJ KT77; JJ EL34 II; Svetlana EL34; Genalex Gold Lion KT77 and Mullard EL34) I jumped at the opportunity. This calculator uses the power equation. Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) 4. Meaning it has high overall costs, which have to be spread over all tubes. I am working on posting the RCA HB-3 Tube Handbook on line on this. The 6V6 is a beam-power tetrode vacuum tube. A Holes on the Tube Top labeled "A" are LED indicators for the bias of the power tubes situated nearest. EL34 comparison at a glance. Chart properties provide many ways to customize chart appearance. Tube type: ----Choose---- 6V6 EL84/6BQ5 5881 EL34 KT66 6L6GC KT88/6550. Posted on December 1, 2001. 4V bias at the suppressor grid was particularly interesting, considering that much of the effort in pentode and beam tetrode design during the tube era concentrated around the low plate voltage operation region; remember the KT-"kinkless tetrode" English line of tubes, with the KT88 being one of the most famous?. 4 KT88/6550/KT90/300B or 4 x EL34, 5881, 6L6GC, 807. Sencore TC142 Tube Valve Tester Guitar Bass Amp Radio 6L6 KT88 12AX7 | eBay. Wrong bias will destroy your tubes and possibly your amplifier. Any of the standard octal-base power pentodes common in today’s audio amplifiers. For example, a tube requires -10V of bias to conduct 50mA, then the cathode can be raised to +10V with the grid at 0V. 2 x 12AX7 NOS Tungsram, 1964. The amp can also handle the even more powerful KT150. The tubes will be running at a slightly cooler bias, but many customers have been using these higher dissipation tubes with great success. The power tube calculators will calculate power output in SE Class A, PP Class A, AB and B and will have modes for triode wired. and became quick competition for the USA made 6550 tube. We may have assigned "G" Price Codes to:. 82 (0) Black Grill Cloth, 34" Wide. These are the finest of the Mullard produced 6267, with a 10,000 hour heater life, carefully controlled output, and very low noise, early 1960s stock. KT88 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:35:29 PM. We see some cloned tube (KT88) Some tubes have elements (see periodic charts) added inside , called Calcium oxide, CAO or Barium oxide Bias, and Plate supplies (yes a small horror then) The below radios use 75mA of filament current alone, 10 times what the transistor radio needs to operate. IR g —k (cathode bias) Rg—k (fixed bias) *Triode connection Base Bulb Max. In addition to the data I have scanned and posted, if you're looking for data on a particular tube you should visit TSDL on Duncanamps website, or Frank's tube data. 99 previous price $19. Specifically designed for audio amplification, the KT88 has similar ratings to the American 6550 which was designed for use as a servo amplifier. Sounds incredible for guitar OR bass. Re-biasing of output tubes. Standard, Pro, and elite. The calculator will give you the bias current for each tube. The glow from four "Electro Harmonix KT88" brand power tubes lights up the inside of a Traynor YBA-200 bass guitar amplifier Vacuum tubes (valves) were by far the dominant active electronic components in most instrument amplifier applications until the 1970s, when semiconductors (transistors) started taking over for performance and economic. Any of the standard octal-base power pentodes common in today's audio amplifiers. The EL84 tube has a snarly sound (bright with midrange punch), and is usually found in smaller wattage amplifiers. External bias adjustment and test points are located on the chassis near the output tube sockets. to allow speakers from 4 Ohms to 16 Ohms. Use this tool at your own Risk. One of the DSPs on the circuit board of Fractal Audio's amp modelers is devoted to amp modeling. · Width, Height – size of the chart. Other popular choices are Svetlana EL34-SV and JJ E34L. It has been designed around the magnificent KT120, one of the toughest tubes available. The label which says to adjust bias to -51 VDC for 6550 tubes. This is the very rare Mullard 10M series gold pin version of this audiophile tube. Higher powers are obtainable with either very large power valves, or by using multiple valves in. with Easy Pay i. Mullard EL34 does very well in our vintage Marshalls also. When biasing to 70% or whatever percent you’re looking for you simply multiply the answer by that number divided by 100. So R is 200 ohms. It also has a set of balanced inputs as well as RCA ins. Plus you Bias them same as you would regular kt-88's. But may go longer in an amplifier with a conservative design. For sale is a 1966 Fender Mustang in Daphne Blue with the original case. Turn on your power amp and let the tubes get warm (3-5 minutes) read the bias measurement. Valvole finali 4 x KT88. The KT88-TK is a beam-power tetrode that shares similar applications as the 61. The default matching tubes of this machine is KT88. The amps had been serviced recently elsewhere and the work done was trivial compared to what was actually needed. The chart also lists the 6AG7 as good for 7. Bias controls: (left and right sides) TUBES: 8-KT88/6550 output, 4-12AX7A, 2-12AT7. DC voltage measured between plate and cathode. 5 k12 Total Anode Current (Zero signal) la(o)coc 60 60 mA Total Screen Grid. Not for 7591 tubes. 5 Watts out up to 10 MHz. A super value compared with TV-10 and TV-7. Specifically designed for audio amplification, the KT88 has similar ratings to the American 6550 which was designed for use as a servo amplifier. So, it was designed to run at about %80 of its max in the MK3. KT88-98(KT88), 6550 and CV5220 5881A(5881) 6L6G, 6L6GA, 6L6GB and 6L6GC 6L6GCR(6L6G) 6L6G and 5881 6P3P 6L6G Pentode EL34A(EL34) 6CA7 EL156 KT series and 6550 Emitter Tube 572B 805(FU-5) GL-805 807(FU-7J) UY-807 811(FU-811) 811A 845B UY-845 Rectifier 274B 5Z3P and 5Z3PA 5Z3PAT(5Z3P) 5U4G and CV841. The triode configuration employed achieves longer vacuum tube life and a highly transparent timbre that vacuum tube amps are known for. 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. 3V at 2A+ to feed the valve heater. Black Pro-Ject Pre Box S2 Digital. Mechanical Data:. Other tubes from the 6550/KT88 family will work, but the best overall sound can only be obtained from the KT120. How you operate the tubes (ultra-linear, bias, plate voltage, operating points, etc. BIAS ADJUSTMENTS:. This guitar is in good condition, and in perfect working order. 65 Super Reverb Amplifier. Compatible with 32ohm-300ohm headphones using the “32ohm” 1/4″ jack. Joined: Jun 20, 2016. 5881 Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34 6550 6L6 KT88 CT1-C, Cathode Current. I set the English R7 Bias pot to the chart for 6L6. Bias is not critical IMO, if it sounds great, bias is smart, but I never bothered, may or may not bias my Cayin. Also the most common electrical circuits are given for KT88 and 6550. The published spec by Philips for EL34 is 500K-700K (that doesn't mean that using 700K grid resistors is good practice). Tubular overall length seated length diameter Cout Triode 125 mm 1 10 mm. 2A3 is super good tone and power is enough for 91dB/m Speaker System. Not for 7591 tubes. Check Price On Plugin Boutique Check Price On Positive Grid. Tube matching is required when 2 or more tubes are operated in push-pull in an output circuit. For full wattage a KT88 is run at 700-800 volts. They will most 8 pins octal including EL34, 6L6GC, 6V6GT, 5881, 6550, KT-66,KT88, 7027,7027A, KT88's. jpの国際ニュースについてのページです。. Following Ohm's Law, 10 (volts) = 0. Meaning it has high overall costs, which have to be spread over all tubes. The 6L6, 6V6, 6550, EL34, 5881, KT66, KT88, KT90, KT100, etc. Cathode Bias/automatic bias allows for easy tube changes without adjustment. Debuting in 1969, the 400 PS was a behemoth conservatively rated at 435 watts RMS. No change in bias would indicate other problems, such as poor system grounding, an unstable preamp, a shorted speaker, etc. A beam tetrode tube that would operate in place of the EL34 Pentode. Tech stuff aside, the KT88 is a gorgeous sounding tube. Allow another ~~35V for drop in OT primary, we need 420V at OT B+ feed. w w 12 Connection t Resistors of 20% tolerance mav bc used. KT77s bias just like EL34s. ProductId : 27005690. An amplifier tube controls the flow of electrons running through it. My contribution: a collection of triode solvers for DC bias. For measuring the probes are simply installed between the tube socket and the tube, connected to the TAD BiasMaster. There is a lot schematics on the internet, but finding a good one is pretty hard. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. 自動車メーカーや工作機械メーカーなどに向けた製品設計や金型設計、解析業務などをお任せします。3d-cadを使い、自動車関連(エンジン等)の部品図の作成などからスタートし、製品の新規開発設計から搭載検討、エンドユーザーに合わせたカスタマイズ設計など、様々な設計業務があります。. es Networks Asia Global PTE. Turn the knobs on your amplifier or other device to activate each tube. The default matching tubes of this machine is KT88. Other popular choices are Svetlana EL34-SV and JJ E34L. max KT88’s, EL34’s and 6550’s are interchangeable with a bias adjustment. The KT88's are pulling about 32mA ( the right bias meter ) where they should be pulling about 60mA. It was originally equipped with (6) 6146 tubes in the PA stage but due. The 12AX7A vacuum tubes are for the Balanced and Input amps, while the 12AT7 tubes are for the Voltage and Driver amps. The tester is in good condition for age, comes with the original paperwork, manual & charts are a little worn but all there. Two tubes in Class AB1 give a continuous output of up to 120W. February 5, 2015. supply was easily able to supply 150mA+ into a KT88 under test. The Valve Wizard. När det gäller bias/viloströmmen så är detta en hel del beroende på vilket fabrikat av 6550 eller KT88 rör det för närvarande sitter i just ditt exemplar, samt också hur hög anodspänningen, då detta kan variera något i olika Signatur exemplar. Meaning it has high overall costs, which have to be spread over all tubes. class – A – all power tubes patent full auto biasing ( pre selectable ) CHALLENGER 115 / 145 Watt using 6 x El34, 180 Wat using 6550 ( China brown socket – recommend ) – no use “JJ” brand. Oscilloscope) have chart properties. Weight 135 lb. A KT88 tube has a recommended bias at around 380mv-420mv. Trim-pots for KT88 Bias adjustments. Following Ohm's Law, 10 (volts) = 0. es Networks Asia Global PTE. 6l6gc, 5881, el34, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. Bias meters allow you to plug an ammeter (current meter) into the tube socket for an easy access measurement of the idle plate current. I decided to build a tube amp for the fun. In America, this tube is known as the. Increases gain, sustain, tone and in some cases converts a bias balance pot to a true bias pot. 6550 Tube Selection Guide. Includes two 8-pin probes with gold plated pins and socket, power adapter and operating instructions. 2 x 12AX7 NOS Tungsram, 1964. I think what you need instead is a good tube substitution chart which will tell you if the A versions are straight 164: Re: question about 83 (4. Real easy to use even if you've never used a tester before, set 4 dials from the settings in the chart book & press a switch. An amplifier tube controls the flow of electrons running through it. Bias Amp 2 Pro. 2021 Billboard Music Awards Winners List. 4 volts press P4. KT88's or 6550 tubes will last longer in an ST-70 than EL34 tubes. We hope you enjoy unlocking your Blackstar Potential. Tube Bias Calculator Instructions & Help. Multi-Watt TM. NOTE: This will not help much, if at all, on a DR103 with the old original Partridges, because these do NOT have enough bias voltage for this to work well. According to the Dynaco manual, the MK3 was designed to run a KT88 tube at: 480V x. Improved bias circuits for the original 50 and 100 watt amps. Finding the right amp for your bedroom and smaller clubs, can be a challenge. In these calculations, 5% of the cathode current is assumed to be screen current. One step above is to take the 8 triodes (16 elements) and add the plate current. Sencore TC142 Tube Valve Tester Guitar Bass Amp Radio 6L6 KT88 12AX7 | eBay. Higher powers are obtainable with either very large power valves, or by using multiple valves in. There are many charts online that will give you the proper range of current for your tubes. Solid state rectifier bridges. KT90 and types and brands exist, and what you can do with the this tube. PT is an Antek with two 230v windings stacked, OT is a Fender PS-160 new old stock I bought from Bob Rizzi (Risson Amps). EL34 Ratings. KT88 and grid leak/bias feed resistors. Buy, sell, and trade high end audio and Home Theater equipment. The citation, while lovely, sounded almost flat and uninvolving compared to this KT88 amp with the fully regulated high voltage supplies for each channel and the adaptive bias system. are all easily biased with this method. I prefer their sound (bias unchanged). I suspect the reason is related to thermal problems and the use of common (joint) cathode bias. class players from all genres of music. FREE Delivery Across Faroe Islands. The average gain of the other unit before blueprinting was only 83. New or used. CA-4 and newer testers. It also has a set of balanced inputs as well as RCA ins. I have read quite a bit but I can't find any solid info on what works and what dose not. Hand-crafted electric guitar pickups, acoustic guitar pickups, bass pickups and pedals. The ProLogue & DiaLogue One, Four, and Six amplifiers can use 6550 and KT88 tube types without any issues. With a cold bias the sound is sterile and dull. Black Pro-Ject Pre Box S2 Digital. When biasing to 70% or whatever percent you're looking for you simply multiply the answer by that number divided by 100. Linear Audio T-reg V5. KT88's or 6550 tubes will last longer in an ST-70 than EL34 tubes. Distributed by parts distributor Magic Parts, the Maxi-Matcher is a handy, comprehensive tube tester that allows for precise matching of output tubes in terms of bias and transconductance. The 30V tapped transformer also provides a variable grid bias supply via D2, C2 and VR1 and a source of 6. The Delta 88 will take its place on top the Dr. My Marshalls are all biased a little differently. We use cookies to provide you with a great experience and to help our website run effectively. 1 choice for the audio Connoisseur searching for that ultimate tone. This guitar is in good condition, and in perfect working order. Checking An Unknown Output Transformer We can now use this knowledge to determine the impedance of any unknown output transformer. 65 Super Reverb Amplifier. Use this as a guide for setting your bias. and British musicians in favor of which are modified and uprated in power dissipation rating from their KT88 and EL34 prototypes. I got worried the iron would fry. V6-V9- 6L6GC (50/100 Watt) and KT88 (150 Watt) Output Each fine production tube is tested and matched to our exacting specifications. All the vacuum tubes are covered by a 12-gauge stainless steel wire cage with a black powder coated finish. We'll call this variable x. Wagner Electronic Services is the seller, distributor for wide variety of electronic parts / active and passive components such as PVC Tuners, Tantalum Capacitors, metalized polypropylene. A wonderful EL34, with great tone for Hi-Fi as well as for musical instrument amplifications. 50 volts over a 10 ohm resistor on each tube. My contribution: a collection of triode solvers for DC bias. The Minotaur uses the well-regarded MJL3281 and MJL1302 transistor devices at the output in a modified Sziklai configuration for superior linearity. Dynaco Mark III restoration and modification. The story begins in the 1950s with the invention of the EL34 vacuum tube by the Mullard company in England. You can do the overly-elaborate biasing they use, but it just seems unnecessary. Solid state rectifier bridges. This is the very rare Mullard 10M series gold pin version of this audiophile tube. This basic EL34 tube amp is an upgrade to the amp section in the JD-1000RC integrated. FREE Delivery Across Faroe Islands. 16W-17W clean output, 25W-30W grossly clipped. jj-electronic. I am not sure if I can hear any difference in tonal balance following the resetting of the bias to the 'sweetspot' of 35mA but I shall leave it at 35mA (keeping an eye on things regularly). In September of 1950 Tung-Sol introduced the 5881, an uprated and industrial version of the 6L6GA with a 23. com 3 1L34 2P2 1R5 1A2 2S/140G 6D6A-Q 2X2/879 2Z2P 2X3 2Z2P 3A4 2P3 4L20 4P1S 5U4 5Z3P. Fender, with all of its capital and cred, was poised to dominate the game once again. For measuring the probes are simply installed between the tube socket and the tube, connected to the TAD BiasMaster. Re: Biasing KT88's and/or KT120's in a VTA ST-120 - The. (KT88, KT120, and KT150 pentodes can also be used, to respectively provide 40Wpc, 44Wpc, and 48Wpc). Only the highest quality and most consistent vacuum tubes earn the MESA Engineering® seal of approval. An EL34 tube has a recommended bias at around 320mv-350mv. ) will change optimum plate load impedance. I am looking to buy some of the more common model vintage Vacuum tubes for Hi-Fi audio equipment. In America, this tube is known as the. divide this by the plate voltage of 400. It looks like that particular amp was intended for KT88 with a hot-ish bias; the grid leak resistors look to be 100k, which complies with the Penta limit, but not other makes, eg EH, but it isn't usually a problem unless the tubes are run very hot. Wagner Electronic Services is the seller, distributor for wide variety of electronic parts / active and passive components such as PVC Tuners, Tantalum Capacitors, metalized polypropylene. The link shows a modulator circuit that drives a pair of KT88's. We agreed that I'd throw a few of my own tubes, including the Tung-Sol EL34B and Shuguang 6CA7-Zs I. Blackstar Bar Stool Accessories £59. (As shown on the picture). My '77 JMP 2203 is biased to 40mA per tube. The pin out is the same. The TELEFUNKEN Elektroakustik KT88-TK is a newly manufactured and cryogenically treated version of the legendary KT88. The station tests power tubes for short circuits, heater operation and the electrical characteristics of Plate Current (Ip) and Transconductance (Gm). The tube can stop the flow completely (called cutoff) or let it flow at maximum (called saturation). KT77 is, was, sorta British for kickass 6CA7. « on: July 15, 2013, 07:47:53 pm ». With a cathode bias, you do not adjust the grid bias because the thing is self-biasing. The technology of the circuitry is said to provide automatic tube bias correction under various conditions. Please indicate your preference of a gold or black front panel. The amps had been serviced recently elsewhere and the work done was trivial compared to what was actually needed. They will most 8 pins octal including EL34, 6L6GC, 6V6GT, 5881, 6550, KT-66,KT88, 7027,7027A, KT88's. Classic pentodes such as the EL34 and KT88 can output as much as 60 and 100 watts respectively. Below the top small power toroid is the power toroid and toroid choke for the 12. sag) of a small overdriven valve amp, at any volume level. The KT-88 output tubes used in the MQ-88uC, made by JJ Electronic, are known for their power and rich sound quality. The KT88 / KT66 /6550 Directory. The power amp design is a key component of the sound of a real amp, and the Power Amp section in Bias Amp 2 once again provides a wide range of customization options. The numbers of 1. Get rid of those annoying "snaps, crackles. Re-biasing of output tubes. Listen To All The Billboard Music Awards 2021 Winners. If our valve is half a double triode ECC83, where Ca-g is 1. Bias Amp 2 is the ultimate virtual amp designer, authentically recreating the tone and feel of real tube amplifiers, while allowing you to mix and match components to create your ideal amp. Finding the right amp for your bedroom and smaller clubs, can be a challenge. EL84 tubes can be found on Vox AC30s and AC15s along with some smaller Marshall amps such as the DSL combo series. This is a true single ended class A amplifier, using a 5Y3 rectifier and a single 5691 pre-amp tube. 自家用車を本施設にお停めいただく際は、「赤磐市穂崎駐車場利用証」の表面を上にして車外からよく確認できる場所に掲示して下さい。. sag) of a small overdriven valve amp, at any volume level. I am not sure if I can hear any difference in tonal balance following the resetting of the bias to the 'sweetspot' of 35mA but I shall leave it at 35mA (keeping an eye on things regularly). Bias Amp 2 is the ultimate virtual amp designer, authentically recreating the tone and feel of real tube amplifiers, while allowing you to mix and match components to create your ideal amp. Solid state rectifier bridges. How to use? Look up the tube ID in 300B-DB sheet. One step above is to take the 8 triodes (16 elements) and add the plate current. analogmetric. V2 is the tremolo oscillator. The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. Z "short chassis" list, which includes: Z-28 at 26 watts, Route 66 at 32 watts, KT-45 at 45 watts. The amp can also handle the even more powerful KT150. The speaker is a 1×12″ Celestion V-Type. [Vacuum Tube Cross Reference Table ]Analog Metric www. Unlike the Icon Audio and Ming Da, which display their valves proudly and the Peachtree hybrid, which displays its valves through a sealed window, the Jolida hybrid looks like a basic solid state amp and is ideal if that is the form factor that you want in your system. When biasing to 70% or whatever percent you’re looking for you simply multiply the answer by that number divided by 100. Both monoblocks had their original multisection can capacitors, tubes. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. « on: July 15, 2013, 07:47:53 pm ». Use this as a guide for setting your bias. A preset on Fractal Audio's amp modelers can have one or two Amp blocks, depending on the product. KT66, KT77, KT88, KT90, KT100 and others1. vick1000, Nov 18, 2013. CA-4 and newer testers. The bass is tight, full, and precise with a neutral midrange and transparent high end clarity. Enter values in blue and click any Calculate button. set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode,. This is required in all "fixed bias" amps when new power tubes are introduced. Available only on our website! From "woody" to narrow panel to brownface to blackface Reverb, an in-depth exploration of Fender Deluxe. Elekit TU-8200R DX 6L6GC Integrated Amplifier/HPA Kit with Lundahl Transformers. By 1954, though, the 15” speaker had given way to four 10” Jensens, and Fender were utilising dual tube rectifiers and fixed (as opposed to cathode) bias for a punchier, higher-wattage performance. The purpose of this KT88 / KT66 /6550 / KT90 / KT120 page is to give an overview about what KT66, KT88. A cultural bias formed during those years among U. Additionally they don't behave well in this particular amp. Solving for I we get. AND has several Western Electric tubes types right on the chart! 300A/B, 101L, 102L, 396A, and 417A! Will also test most common audio tubes like 6CA7, 6L6, 6SN7, KT88, 7247, 12AX, AU, AT, 7247, 7199,7355, 7591 and 7868 (with adapter). EL34’s run at about 20 watts. If the 3 amp (slo-blo) fuse blows, replace it with the same type fuse and check the bias. The EL84 can be brighter than the EL34 and generally has a bit less low-end. in Canada: System: Line Magnetic LM-518IA. When pushed, EL34 tube will produce wonderful quintessential classic Marshall tone that's instantly recognizable. The 6L6, 6V6, 6550, EL34, 5881, KT66, KT88, KT90, KT100, etc. We’ll call this variable x. Came with 6550’s (seller said biased for them). in Canada: System: Line Magnetic LM-518IA. #3 additional gain, mostly for the lead channel. Listen To All The Billboard Music Awards 2021 Winners. An audio Baskin Robbins of Triode flavors. Bias is not critical IMO, if it sounds great, bias is smart, but I never bothered, may or may not bias my Cayin. « on: July 15, 2013, 07:47:53 pm ». KT66, KT77, KT88, KT90, KT100 and others1. #4- effects loop. Specifically designed for audio amplification, the KT88 has similar ratings to the American 6550 which was designed for use as a servo amplifier. As in its other amps, PrimaLuna's Adaptive Auto-Bias circuitry is used to monitor power-tube performance and eliminate the need to buy tubes in matched pairs. The 5881 SHOULD be ok with the plate voltages found in most guitar amplifiers designed for the 6L6GC. This is especially important when the circuit is a fixed bias circuit and the tubes are operated at or even a little. 3 HS-5348-1 Bias 1. for instance: My Cayin Amp. Most of them show these audio beauties used in the push-pull configuration in order to obtain the greatest efficiency and the most power output. All of the tubes listed above have their cathodes on pin EIGHT, which will be grounded to the chassis. com DA: 12 PA: 11 MOZ Rank: 23. 0: 6SN7 (2), KT88 (2) 230: Audio Amplifier with transistor [In Dutch] Schematic Only. Mullard EL34 does very well in our vintage Marshalls also. I am wondering what is the problem with using 220k since my current build uses a LARMAR Master which is just over 225k. For 8-pin power tubes such as 6L6, 6V6, 5881, 6550, EL34, KT88, KT66, KT100, etc. This calculator uses the power equation. Use this as a guide for setting your bias. All MESA® tubes offer unsurpassed consistency and reliability for ANY tube amplifier, and certainly MESA amplifiers!. When biasing to 70% or whatever percent you’re looking for you simply multiply the answer by that number divided by 100. Use this tool at your own Risk. Only a few of the most popular tubes are shown. Came with 6550’s (seller said biased for them). In gray fabrikoid- covered portable wood case. Increases gain, sustain, tone and in some cases converts a bias balance pot to a true bias pot. CNNの国際ネットワークと直結したニュースサイトCNN. Looks like somebody re-jiggered a Williamson for fixed-bias UL KT88's. 1, 1957, 2 pages: 10/1/1957: 3200-42: Download: 539A: Foreign Tube Test Data : Download: 539B. Grey rows represent discontinued and unavailable tubes. The chart they supply says the 6s are 25 watts and every place else says it's 30 watts. For sale is a 1966 Fender Mustang in Daphne Blue with the original case. supply was easily able to supply 150mA+ into a KT88 under test. Single Ended 2 x 8 Watt Class "A" (KT88) Uses push-pull 6SN7, then KT88. Some portions of the circuit are best built on PCBs. 2 180 150 Typical Operation and Characteristics Plate Voltage Grid Voltage Plate Current Transconductance Internal Plate Resistance (approx. Unlike the Icon Audio and Ming Da, which display their valves proudly and the Peachtree hybrid, which displays its valves through a sealed window, the Jolida hybrid looks like a basic solid state amp and is ideal if that is the form factor that you want in your system. These are the finest of the Mullard produced 6267, with a 10,000 hour heater life, carefully controlled output, and very low noise, early 1960s stock. For Compactron's (3 tubes in one glass bulb!) I have 6AS11 radio. 3 x12ax7 4 kt88 mute on unless spkr in bright active hand built in petaluma, california u. 1pc Gold plated Tube amp bias tester for 7868 Tube amp. max 165,0 max 63,0 max 46,0 max 150,0 Capacitances: cg1 = 17 pF ca = 11 pF cg1-a = 7,5 pF. seen as dial above % I turn on the tube tester now. kt88/6550 is a different animal, look for a little over 80 watts a pair. The TELEFUNKEN Elektroakustik KT88-TK is a newly manufactured and cryogenically treated version of the legendary KT88. Characteristics Svetlana Outline drawing T SVETLANA TECHNICAL DATA EL34/6CA7 High Performance Audio Power Pentode he Svetlana™ EL34 is a glass envelope power pentode having a plate dissipation rating of 25 Watts with convection cooling. Owner's manual included. According to the Dynaco manual, the MK3 was designed to run a KT88 tube at: 480V x. The tubes included with the Inspire KT-88SE Fire-Bottle: a pair of brand new Genalex KT-88 output tubes , a NOS 6SN7 input tube along with a NOS 5U4G rectifier tube. I am wondering what is the problem with using 220k since my current build uses a LARMAR Master which is just over 225k. We’ll call this variable x. Bias is not critical IMO, if it sounds great, bias is smart, but I never bothered, may or may not bias my Cayin. One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. In America, this tube is known as the. This is done with a resistor in the cathode circuit. Enter values in blue and click any Calculate button. In Stock Only 4 Left Compare. Kavin's stash). Elekit TU-8200DX Stereo Tube Amplifier Kit. 8k : 2 to 14 ohms with 51T x 51S core, all details. 技術力 コミュニケーション能力 向上心. Second: for KT88 tubes, the output is limited to the voltage of the power supply. In many cases the bias will be set in the center of the acceptable range so random pairs of output tubes will work safely with the intended load range, eg. 40 watts in cathode bias using a pair of 40 Watt line trannies looks attainable, but 55-60 watts needs a bias supply and our centre-driven multiplier presents problems. Click here to see our "Power Tube Comparison Chart" which includes a list of correct bias voltages for Groove Tubes power valves. Power Transformer 120/240 volt dual ac primary for operation in any country. I doubt that any tech will bias a KT88 or 6550 amp hotter than that without a good reason, what ever that reason may be. 0: 6SN7 (2), KT88 (2) 230: Audio Amplifier with transistor [In Dutch] Schematic Only. and British musicians in favor of which are modified and uprated in power dissipation rating from their KT88 and EL34 prototypes. A cultural bias formed during those years among U. The KT88 also can handle larger plate voltages, up to 800 volts. Circuito VBS, bias autoregolante per la massima linearità. When biasing to 70% or whatever percent you’re looking for you simply multiply the answer by that number divided by 100. Characteristics Svetlana Outline drawing T SVETLANA TECHNICAL DATA EL34/6CA7 High Performance Audio Power Pentode he Svetlana™ EL34 is a glass envelope power pentode having a plate dissipation rating of 25 Watts with convection cooling. 5881 Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34 6550 6L6 KT88 CT1-C, Cathode Current. The cathode resistor is near-enough for all common octal types, as is the output transformer load (because it is self-biasing). Free Shipping on orders $105 and over. Looking from right to left, the tubes are arranged as follows: #1 Input gain/2nd gain stage-shared by rhythm and lead. The Matcher II is a compact precision measurement station for the test bench or sales counter. My Marshalls are all biased a little differently. They use a fixed resistor soldered into the. had to change the way they hang ,took out the 6L6 clamps and used the kt88 spring type. Pre passivo per 3 ingressi gestibili da telecomando in. Both monoblocks had their original multisection can capacitors, tubes. 99 5% off 5% off previous price $19. OPT5 for SE 1. For guitar amps, one of the top choice is Tung-Sol EL34B. JOLIDA JD1501BRC. The label which says to adjust bias to -51 VDC for 6550 tubes. The circuit is wired for class B, zero bias. Also there will be voltage losses in filtering, and self-bias is good. The Bruiser is a heavy duty stereo tube amp designed to handle these types of speakers. The KT88 is unique in that it behaves a little like a cross between a 6L6 and an EL34 with smooth silky upper harmonics and good bottom end clarity. set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode,. thetubestore. Single-ended (SE) power output stages are probably the simplest form of power amplifier. Last Update: Description. Bias adjustment is MANDATORY. Below the top small power toroid is the power toroid and toroid choke for the 12. Calculating B+ for direct coupled SE amp. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. It delivers lots of bite in the top end, punchy mids and well-focussed bass power. The Matcher II is a compact precision measurement station for the test bench or sales counter. The bias meter will also allow fine tuning of the KT88 tube to sound its best. The $450 Maxi-Matcher contains four tube sockets and can test output tubes, such as the popular 6L6, and 5881, 6V6, 6550, EL34, KT88, EL84 and 7027s. This information is for reference only. Power-supply rectification is solid-state, and output transformers, mains transformer, and power-supply choke are all designed and made by Luxman. Tube Data Sheet Locator. The amps had been serviced recently elsewhere and the work done was trivial compared to what was actually needed. com 6L6GC a. The Delta 88 will take its place on top the Dr. Sansui AU-9500- leaky tantalum coupling caps, dirty controls, bad bias pot. It's still valid to try a cooler bias and so benefit from a longer tube life etc. You have to bias 6550 or KT88 tubes a little higher than the 42-43 Ma that you mention above. In the Full position, all four KT88 power tubes are utilized. It has even less distortion and an even cleaner tone then the 6L6 or even the 6550. When Jon Esau of www. It is still in use in audio applications, especially electric guitar. The bias meter will also allow fine tuning of the KT88 tube to sound its best. If fuse blowing continues, these possibili-ties should be checked. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. Enter plate voltage: Select output tube: EL84: 6v6: 6L6: 7027: KT66/EL34: 6L6GC: kt77: KT88: 6550: KT120: This information is for reference only. The Prodigy does not have the Lo setting of the Strategy, but it’s really not needed on this amp. com EMAIL US ANYTIME for QUESTIONS, QUOTES, SHIPPING, ETC. You want to bias to about 70 percent dissipation. Very clean Eico model 667 tube and transistor tester. Locations V5 to V8 and LV5 to LV8 indicate placement for the 6550C/KT88 power tubes. CA-4 and newer testers. It sounded much better than the old tubes. The first of this family of tubes to be introduced was the 6V6G by Ken-Rad Tube & Lamp Corporation in late 1936, with the availability by December of both Ken-Rad and Raytheon 6V6G tubes announced. 2pc Tube amp bias tester for el34 6v6 6l6 kt88 6550 5881 7024 "mV"test mode. 利府第二おおぞら幼稚園 〒981-0134 宮城郡利府町しらかし台4-3-1 tel/022-356-0530 fax/022-356-5970. WARNING: A tube amplifier chassis contains lethal high voltage--sometimes over 700 volts AC and 500 volts DC. The Cerebrum or cortex is the forward-most portion and largest part of the human brain. The circuit is wired for class B, zero bias. Cayin A-88T MK2 tube EL34/KT88/6550 Integrated amplifier audiophile power amp $1,449. The KT88's are pulling about 32mA ( the right bias meter ) where they should be pulling about 60mA. SG~GUY, Mar 16, 2016 #8. I set the English R7 Bias pot to the chart for 6L6. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. The tube lineup is: 6L6, 6L6, 12AX7, 12AX7, 6AV6, 5U4. THE AUTO BIAS TEST CARD. So the 6L6GC will give you more power and more clean headroom. Consistently, the left channel, powered by the E-H 6550s, seemed more alive, more. 2 / 1600 and 100 are design spec data for a proper 12AX7 vacuum tube. This will enable you to figure out the year your amp was made. The bias meter will also allow fine tuning of the KT88 tube to sound its best. The KT88 / KT66 /6550 Directory. The pin out is the same. NOTE: This will not help much, if at all, on a DR103 with the old original Partridges, because these do NOT have enough bias voltage for this to work well. KT88 Load line, online calculator One up grade, is this from the maker, the charts are available even for the 532. Any of the standard octal-base power pentodes common in today’s audio amplifiers. If folded pullout pages are in the original, they are in ours also. Eurotubes Pro One Bias Probe for Octal Base Power Tubes. P is the power rating of the power tube, I is the bias current, and V is the plate voltage of the power tube. America's Largest FREE Audio/Hifi and Home Theater classifieds site. Charles, MO 63304 Phone 636-939-9190 24 Hour Fax 636-922-0601. A better conversion would offered by a 180-ohm resistor, which would set an idle current of 100mA through the output tube and offer a conversion ratio of 55mA per input. A spinoff from now-defunct state factory Tesla factory. Re-biasing of output tubes. A Holes on the Tube Top labeled “A” are LED indicators for the bias of the power tubes situated nearest. There are many charts online that will give you the proper range of current for your tubes. there used to be a link on the Fender website for amp dating from the serial numbers. That's twice the output of an average pair of 6L6 tubes. This calculator uses the power equation. This rare tube is vanishing fast from the marketplace. See What ‘The Shining. B Holes labeled "B" are the location of the bias controls. Locations V5 to V8 and LV5 to LV8 indicate placement for the 6550C/KT88 power tubes. Some portions of the circuit are best built on PCBs. The Shiva is a masterful study of refined elegance, providing the synergy of one's heart and hands. class – A – all power tubes patent full auto biasing ( pre selectable ) CHALLENGER 115 / 145 Watt using 6 x El34, 180 Wat using 6550 ( China brown socket – recommend ) – no use “JJ” brand. Additionally they don't behave well in this particular amp. A98 11A I believe is just manufacturing and batch number data. This is the one you want if you're working with vintage electronics. The settings for a KT88 on a 539B are:. 4 volts press P4. It is identical to the 200s but was supposed to be paired with a different cab. E34L, E34LS. And they work well in audiophile as well as guitar applications. 16W-17W clean output, 25W-30W grossly clipped. The low bias position is more suited for the EL34 tubes that the EVO 100 is shipped with. It also has a set of balanced inputs as well as RCA ins. FREE Returns. Debuting in 1969, the 400 PS was a behemoth conservatively rated at 435 watts RMS. The Bias Easy™ 1200 allows you to monitor the bias setting safely and easily. Second: for KT88 tubes, the output is limited to the voltage of the power supply. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Confusingly enough, "fixed bias" amps are the ones that generally have adjustable bias levels that need to be checked and reset when you change tubes. Power cord is replaced with a grounded 3-prong. ← The 2 large toroid trannys create the 560V B+ supply. The published spec by Philips for EL34 is 500K-700K (that doesn't mean that using 700K grid resistors is good practice). This calculator allows you to trace the anode characteristics graph, and to compute and tune loadline and operating point of various vacuum tubes. It adds ultra-fast Hexfreds to the power supply as well as other custom Jolida parts. But as with any tube change, you need to check and rebias the amp, as even the same brand and model tubes will bias differently in every amp, thus the reason for matching tubes. 6% positive. The fully regulated version outputs 65 watts/ch from about 26. Hickok always listed the 6550 under KT88. are all easily biased with this method. So use that setting as your base. 59 Bassman Amplifier. The buyer receives a whole set of tubes (in a separate box), for self-assembly. 66: JTM45 MKIV 1962: 7304: Black Levant: 784-103: 1202-55: U Frame: Aluminum (End Blocks) Bulgin: 8,16,100V Jumper Style: Yes. Andy, I just eyeballed the bias voltages based on a chart I had for KT88 plate voltages. EL34 excels at reproducing horns and female vocals, with silky smooth texture. All original except bias supply capacitor Has tube chart date code OA (January 1965) and speaker date (465 515) Oxford, 15th week of 1965. Choose KT88 and 600V and you'll get. for instance: My Cayin Amp. JOLIDA JD1501BRC. With an output of 300 Watts, it provides enough high power to drive even the most demanding loudspeaker. Fender, with all of its capital and cred, was poised to dominate the game once again. Model Chart; Downloads and Resources Does a bias resistor or any other component(s) have to be swapped out as well ?. range C Min Mut Cond=6250. a KT88 or 6550 operated fixed bias is in the range of 100K-220K. Re-biasing of output tubes. Tube Type. This list is our current tube type, location and bias points for all of the Dr. class players from all genres of music. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. Original NOS tubes, Mullard, RCA, Bugel Boy, etc Non-original soft case / cover included. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. 3) GZ37 (3 amp filament current) 4) 5V4G/A (Possibly lower if plate current of the power tubes is high enough) 5) 5U4/G/A/B (3 amp filament current) 6) 5R4G/A/B. com EMAIL US ANYTIME for QUESTIONS, QUOTES, SHIPPING, ETC. Not to be confused with Russian made KT88. So back to push pulls, as EL34 and EL84 i allready made many before and the KT88 family is one of my favourites i choose for a KT88 design. Blackstar Sock Monkey Accessories £22. 0 * P4 * C * 3150 These tubes run at higher voltages and currents than the Hickok can provide. We’ll call this variable x. The circuit is wired for class B, zero bias. The amps had been serviced recently elsewhere and the work done was trivial compared to what was actually needed. Tom Schlangen - ETF 06 Pentodes connected as Triodes 4 All additional grids serve a certain purpose and function - they were added to a basic triode system to improve the system behaviour in. I had a pair running 150 % mod, Later removed them and put the rig back to stock. at Desertcart. Locations V5 to V8 and LV5 to LV8 indicate placement for the 6550C/KT88 power tubes. REPLACEMENTS & UPGRADES FOR DYNACO, FENDER, MARSHALL, VOX, & MORE, ALL MADE IN USA! Plus everything else you need for your build, mod, repair, or restoration! CUSTOMER SERVICE & ALL OTHER QUESTIONS: 1-800-774-3201 Option #1 OR [email protected] For measuring the probes are simply installed between the tube socket and the tube, connected to the TAD BiasMaster. Don't know what the Rk would be (140-150R, maybe) to create that bias voltage and current. Great Prices! I have two single tubes left in stock for $89. No change in bias would indicate other problems, such as poor system grounding, an unstable preamp, a shorted speaker, etc. A super value compared with TV-10 and TV-7. OPT5 for SE 1. The TELEFUNKEN Elektroakustik KT88-TK is a newly manufactured and cryogenically treated version of the legendary KT88. Thanks Ian and Kirk. KT88 screen grids are operated at approximately 360 volts provided by a separate power supply formed by one-half of a voltage doubler supplying the plates with 725 volts. Lovely amp of course. It is generally associated with higher brain functions such as conscious thought, and sensory processing. Improved bias circuits for the original 50 and 100 watt amps. How you operate the tubes (ultra-linear, bias, plate voltage, operating points, etc. Valvole finali 4 x KT88. Fender, with all of its capital and cred, was poised to dominate the game once again. They use a fixed resistor soldered into the. Salt Lake City, Utah, 841**, UNITED STATES OF AMERICA. Last suggested retail price $15,000. My contribution: a collection of triode solvers for DC bias. Standard, Pro, and elite. Pure hand-made, Point to point manual welding. Typical solid state guitar amps- cracked pcb traces on input and output jacks, dirty controls, bad output ICs. So, it was designed to run at about %80 of its max in the MK3. Also the most common electrical circuits are given for KT88 and 6550. The chart also lists the 6AG7 as good for 7. Looks like somebody re-jiggered a Williamson for fixed-bias UL KT88's. The low and medium gain sounds are balanced and spacious, while the clean tones can be pristine, chunky, crisp or edgy. 3 x12ax7 4 kt88 mute on unless spkr in bright active hand built in petaluma, california u. Plus, you can experiment with different bias settings for each pair and check out how the amps tone and feel changes when you try lower or higher bias settings from the recommended factory settings. It also has a set of balanced inputs as well as RCA ins. This information is for reference only.