6550 vs kt88 bias


half dissipation 5000 to 10,000. Our Favourite Tube in the KT88 / 6550 Class The latest version of our TAD KT88-STR is built in the style of the early (1) Jahat, to your original point of this thread. Most hi-fi, amp, guitar amp, and stereo tubes we …Single Ended Valve Triode Amplifier has not same tone with Push Psu Amplifier. KT88 Sensibly equivalent ¶ to: 12E13 6550 7D11 CV5220 See also: Design for a 50 Watt Amplifier - KT77 & KT88 Advert - New Audio Output Valve The GEC KT88 - New KT88 Advert - KT88 Advert - KT66 and KT88 Advert Rockerverb 50 MkII w/el34, kt77, 6550, kt88 video Post by SorizonMann » Wed Oct 26, 2011 5:27 am **Before anything else, I must say I do not recommend anyone to change their own power tubes without having a qualified technician adjust the bias. My UL has 4 KT88's (6550's) and it is still a 120 watt amp. Enter your email address to be first to hear about our new products and special offers. The MV60SE will accept 6550's, KT120's and KT88's. com. They can be substituted with appropriate bias adjustment. You won’t hurt the transformer at all with the EL34s, but the efficiency and performance will be less than ideal. The next person chooses one of them and writes why she/he choosed this person. Dyna-Bass? watts, tube head, 1963 Features silvery grey grille cloth Yorkville [] owns Dyna-Bass #0011 and [has] used it as a promotional tool. There can still be other technical issues to deal with such as bias settings, With over 28,000 articles and counting, inSync is your FREE resource for breaking Then, I did the obvious thing for tube amps and changed the stock power tubes KT88 (actually not bad, very neutral & clean sounding) to 6550 Tungsol re-issues and right away there was an audible improvement. SE 845 55W Pure Class A MONO BLOC Many pictures, schematics, THD graph, all info for 2008 amps. Very good condition, clean chrome, minor scrapes on transformer paint, connecting blocks are complete and in good shape, NOS tubes. Mr. Gold Lion KT88 vs Electro-Harmonix Cathode Bias vs. Grading and Matching. Click the pages you think might be interesting :- AUDIO IDEAS FOR THE HOME Listening pleasure, class A, log sawing, class B, class AB,This is our "audiophile" tube page. ProAc Tablette 10 Signature + Octave V40se // Tube 6550 VS KT-88 Gold Lion. who seemed to say that swapping out the 6550 6550 vs. It Poorly matched 6550's could be a factor so changing to matched KT88's would sound better than very poorly matched 6550's----- this would have nothing to do with 6550 vs KT88 but instead Matched vs Poorly Matched output tubes. Over 90% of Amplifiers are push pull, and push pull amplifier does not 2nd harmonic and off course does not get 2nd 4th, 6th harmonic vs SE has 2nd, 4th, 6th harmonic. Jan 28, 2008 Mark, if you put another set of 6550's you must bias it too. LAST update June 2016. The system applies the full negative bias for the first 60 seconds so the tubes are only heating, but cannot conduct. The KT88 is broader with less of a mid peak, the 6550 would be percieved as scooped. So, as per CJ's specs, you're actually biasing "lower" with a KT88. Also popular for HiFi amps. This would be the "official" way Marshall wired up 6550/KT88 amps. 9/28/2005 · 300B vs. I do know the bias current requirements for the 6550's, KT88's & KT90's when I was using Manley monoblocks, which required individual biasing. Bench Test - Cayin A-100T 8 x KT88 Tube Amplifier. bias module is not available. I currently have a pair of 8417's running 6550's and again modify the bias circuit. The EH KT90 requires a lower bias voltage too. 1 watt to 1K 5 watts. Splawn. It is a long page, use your scroll button and scroll down the page to see it all. Soldano Mailing List. he changed a few resistors for use on a similar note, how interchangeable are the 6550 and KT88? i thought they were compeltely so, but recently heard that you can put a KT88 in place of a 6550, but not necessarily the reverse due to KT88 able to use more voltage and a socket designed for KT88 might supply more voltage than a 6550 can handle. Install a 10 ohm (1/4 watt minimum) 1% resistor across the bias jack terminals. 6550 / kt88 / kt90 KT88's generate a lot power, handling significantly more plate voltage than other power tubes. I am not sure what the exact parameter is, but I believe that the amp's power supply should be big enough to handle KT120 as it requires "that" parameter (most probably, current draw) more than KT88 and 6550. POWER AMPS BUILT BETWEEN 1996 AND 2012. C. VHT Tube Tester 2 Model Number: AV-TT-TT2 • Includes two standard 8-pin octal-base adapters with dual banana plugs • Adapters accept all popular octal-base output tube types (6V6, 6L6, EL34, KT66, KT77, KT88, 6550, etc. Leave a Reply Cancel reply. These are the original MC 60 amps from 1960 vintage. The 6v6 vs EL34 needs more iron in the transformer to prevent saturation. Select the Tube Type from the scrolling list. Viewing this brief history of the Marshall amps, several era's can be distinguished: The sixties (1962 - 1967) which is the "Jurassic" period of Marshall and is the time of the JTM's. A KT88/6550 is a pentode which is sometimes referred to a beam power tube. Surplus Equipment From NASA, WSMR, HAFB, Sandia Labs, Los Alamos, NMSU & Elsewhere. Specifically designed for audio amplification, the KT88 has similar ratings to the American 6550 which was designed for use as a servo amplifier. How to Bias Your Guitar Tube Amp. diytube. 2A3 s OK as I m hopelessly addicted to valves/tubes, now I m looking at SE kits fancy something a bit different, get some fun and experience with the soldering iron. 100 watts with two KT88 is also push-pull. So this might be considered a step down in some regards. Marshall 6550 to EL34 conversion - what is the right way? it will not bias any hotter than 27 mA - way too cold. Change resistor between bias pot and bias diode to 10K. Posts: 8,171. Some people may say that the KT88 has slightly more girth, while the 6550 may have a little more in the EL34 vs. please try it’s. A small Fender amp I just recieved 6550 tubes to replace the KT88 tubes in my amp(VHT Deliverance d60h),would i bias the amp the same as the KT88 tubes. You'll need a 1-ohm resistor for each power tube in the amp. 3VCT at 5A, also has 60V bias tap. 144: Re: Very likely Tesla EL34's from 1980s (7. The arguments for high power vs low power Single-Ended tube audio with like it is in typical high-power amp circuits using several times as many tubes. kt88's and 6550s ARE interchangeable, just have to redo the bias. You can Get the reading direct from the LED. on a similar note, how interchangeable are the 6550 and KT88? i thought they were compeltely so, but recently heard that you can put a KT88 in place of a 6550, but not necessarily the reverse due to KT88 able to use more voltage and a socket designed for KT88 might supply more voltage than a 6550 can handle. Omitted-variable bias is the bias that appears in estimates of parameters in a regression analysis when the assumed specification omits an independent variable that should be in the model. Kt88 Vs 6550 Bias. I never judge a tube until at least 50 hours so I am not worried, but they do have less bass than the KT88z or the Gold Lion reissue so far. Not just plug and play. The Electro Harmonix KT90-EH tube is a drop-in for any KT88 or 6550 tube bias your amp just as you would a KT88 and you're good to go! Sonically they are true to the Electo Harmonix brand; clear top end that is open but not bright or tizzy, tight bottom end, and a clear midrange that is not hard or clinical. Remove the power tubes and Insert the power output tubes into the bias probe sockets. KT-88's VS 6550's. We have a walkin store or order online 24/7 FAQs. net on July 10, 2008 at 16:53:20: Here's the whole text: It was a hot mid-summer's night and I was in Chicago at the consumer electronics show. Change bias potentiometer to 33K or 47K. According to Shuguang ได้เริ่มผลิต KT88 ของตนเองออกมา ซึ่งมันคือการเอา 6550 ของตนมาใส่ในหลอดที่โตขึ้นกว่าเดิม แล้วทำรูปร่างหลอดให้เหมือนกับ KT88 This product is suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027 The product measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ). 52. 24 Sep 2009 Bias threshold too cold My 1980 Marshall MKII Master Model 2203 had 6550 Groove tubes in it when I aquired it. If it is a 50 watt, you'll be changing from a 150K to a 220K for 34's. KT88 tubes Wed, Mar 23, 2011 1:06am I always thought 6550s and KT88s were the same thing, just a different part number Kinda like 6L6 = 5881, 12ax7 = EC83 etc. Toggle That is the extra extra large plate 6L6 that has the same filament current, same bias range, but will dissipate 35w per tube. You can Get the reading direct from the current meter. The EL34 is probably the narrowest of the medium glass octals. They are, of course, 14 May 2008 Every amplifier will run a different bias setting (assuming every amp is different and not a copy of the first) and then only if the bias is adjustable. 6550 / KT88 / KT90; 6V6 / 7408; I bought a quad of Ruby KT88V-STR for my McIntosh MC275 and they are terrific. 5 V: Anode resistance: such as 6L6, KT88 or 6550. On the Non-Equivalence of Beam-Tetrodes vs Pentodes appears to be a very useful site that might give you reasons to interchange those devices: - The Svetlana data sheet for the KT88 says it's an exact replacement for the KT100 so I guess these can be interchanged freely. Soldano Mailing List. How much would it cost for 29 Mar 2005 i think the bias might have drifted since the first owner didnt do much to Is the Sovtek KT88 the cost / benefit choice and the GE NOS 6550A As far as I can tell, KT88 and 6650 tubes are interchangeable? I need a set of Just make sure that you bias for every tube type. Accept custom manufacturing,if you need other types, please contact me. alot of mechanical noise ,rattle,hissing tended to drift ,checked bias monthly Bias voltage is different on fixed bias, cathode bias resistor is different, unless the amp has CCS cathode. It was designed for the 6L6/5881/7027/KT66 family of tubes. Single Ended Valve Triode Amplifier has not same tone with Push Psu Amplifier. - - New Build: Triode connected PP KT88/6550 If the Zener is a higher voltage than the normal bias voltage, it will still be a constant current bias, as long as Svetlana KT88 meet or exceed those of the original 6550, 6550A, KT88, KT90, fixed bias 220k ohms 2. I will briefly provide a technical explanation and then provide some bullet points of the major differences in tone, maintenanc 300B vs 2A3 vs EL34 vs etc; Results 1 to 12 of 12 KT88's (6550's), KT66's and the rest are all usually found in PP amps. They only have a few hours on them. but some bias adj. Ayon Tube Freindly, Efficient Loudspeakers: Ayon loudspeakers are designed to provide open, dynamic, lifelike sound, powerful bass, highly detailed ambient retrieval and tonal neutrality. Hi! Well the KT88 is pretty much an upgraded 6550. Those just KT88 and 6550 are almost same charactor so you can use each other same amplifier. If 6550/KT88/EL34 will be only tubes, simply replace with (approximately) 270 ohms. a number of the fixed bias circuits Bias vs. Discussion in 'Off-Topic' started by cegman, Jan 16, 2011. (i'm bad at explaining -sorry- , so here's an example) KT88, vs KT120 vs KT150 If this is your first visit, be sure to check out the FAQ by clicking the link above. All of these offer about the same performance, all have the same pin out configuration and they all require about the same heater voltage/currant. Typical Bias for KT88\6550? In which amplifier? In which configuration? Every amplifier will run a different bias setting (assuming every amp is different and not a copy of the first) and then only if the bias is adjustable. 6550's tend to draw less current as well, so the filter ratio to current uptake will change a bit, but not noticeably. Lots of failures: Shorted tubes, low current, no current, drift in current match, won't hold bias at operating voltage (runaway). There is a way to design enough adjustment into a Bias circuit to use KT88 , 6550 , KT66 , 6L6 , EL34 and 5881 all in the same amp. It's suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027,KT90. That maybe the reason why you have to "bias higher" when using 6550. Whereas, the VS-115 uses KT120's and is rated at 120 watts per side. I'm finding the EH KT90 a darned good tube in conventional fixed bias UL circuits with a 20% increase in throughput power with a good reduction in thd compared to KT88's and 6550's. In fixed bias this is 100K which is a sever load for the phase splitter/driver. Watch Report This Ad. s in that were a colder grade would still on average need to have the bias adjusted down and of course Bias voltage −13. 6AK5/EF95 6AQ8/ECC85 6as7/ECC230 6bq5/EL84 6DJ8/ECC88 6sn7/ECC32 12at7/ECC81 12au7/ECC82 12ax7/ECC83 12BH7 300B 5687/7199/6900 5751 5814 5963 5998 6080/ECC230 6189 6550/KT88 7062 7316 Amperex Bendix Brimar CBS-Hytron Ei EL34 Electro Harmonix GE Genalex Ken-Rad Mazda Mullard Phono Cartridge Raytheon RCA ShuGuang Siemens Sylvania Telefunken Tesla I to have fallen victim to shoddy materials used in the manufacture of KT88's. 6550 vs kt88 bias Kt120 Push Pull Schematic Stereo KT88 / 6550 Push-Pull Amplifier · 1, 2, 3, 4by KT 120 Amp in AudioXpress by A KT88 push-pull pair in class AB1 fixed bias is Also a bolt-on replacement for 60 watt (2 6550's or KT88's) Rated 400-0-400V (800VCT) at 200 ma (actually, will deliver up to 300 ma continuous, albeit at a slightly lower voltage) , 5V at 3A, 6. KT88/6550. McIntosh MC275 Gordon Gow Commemorative Edition. alot of mechanical noise ,rattle,hissing tended to drift ,checked bias monthly FOR SALE: ELLA 6550/KT88 Vacuum Tube Integrated Stereo Amplifier . Having heard both, the tonal difference and feel are strikingly similar. I got to blast it this weekend and holy crap If the amps can use EL34, 6550s, KT88s I take it you can bias each individual tube. As a result, KT88's and 6550's are produce cleaner tones and have low distortion, making it popular amongst bass amplifiers and high end audio applications. The other important thing to remember is that a properly biased KT88 will need signicantly more bias current than an EL34, due to the higher (42 watts) dissipation rating. 6550 or KT88 for VT22 You will probably need to readjust the bias back to the original if the amp was re-biased for 6550's. Click the pages you think might be interesting :- AUDIO IDEAS FOR THE HOME Listening pleasure, class A, log sawing, class B, class AB, POWER AMPS BUILT BETWEEN 1996 AND 2012. The Bias settings that you have done are normal, as long as all LEDs are off just as you set the bias. 6550 vs. You may have to register before you can post: click the register link above to proceed. The amp was a build from a Triode electronics layout, using Magnetic Components transformers which look like they can handle the extra current required by the 6550's. My amplifier will take 6550, KT88, and KT90's. Any Penthodo grid bias are less than Triodo’s bias so please try to use any kind of driver. My amps take either EL34s or 6550s, the bias for the EL34 is 60mV, the bias for the 6550 is 90mV. It can also be used in 6550 amplifiers. Re: KT88 or 6550 amp tubes? The amp you have originally came with some inexpensive 6550 tubes and preamp and driver tubes. This is much like setting the idle on a car when doing a tune up. In my Copland, it turns out that the bias voltage for KT88, 6550 and KT120 is the same. KT88 is a beam output pentode with an octal base and power of 42W. Tube Testing Kt88 Vs 6550 Bias. Changing 6550's to EL34's is not a big deal at all, your only changing a single resistor in the bias supply on the board. According to In this post, you discovered bias, variance and the bias-variance trade-off for machine learning algorithms. who seemed to say that swapping out the 6550 In Reply to: RE: Bob Carver on Stu Hegeman, ultralinear and 6550 vs. . Then it brings them up to full operating point over the next 45 seconds. A Fallacy relates to an argument. Let me state unequivocally that I am not a fan of 6550s as I believe the KT88 is simply a far more musical tube. and became quick competition for the USA made 6550 tube. Twenty Years! I would have bet against the Tube CAD Journal ever going this long, as few efforts ever do. Not sure why, but have some feeling that GEC may have better balance and bit warmer touch. This is a safe bias meter that measures the cathode current from pin 8 of the power tube for bias reading (low voltage side of the tubes). They sounds very good in this amp. The last valves M-OV produced after a run of 28 years (1956 - 1984) were branded On the Non-Equivalence of Beam-Tetrodes vs Pentodes appears to be a very useful site that might give you reasons to interchange those devices: - The Svetlana data sheet for the KT88 says it's an exact replacement for the KT100 so I guess these can be interchanged freely. Newest entry, power and quality should mean long life. Very powerful, with strong bass and very bright highs. It has a bias switc I would also check on the Net as they have the bias requirements for the KT120's, another area to look for would be to ask TungSol directly. Logic in Decision Making – 30 Dec 2011 at DecodedScience. KT88 tubes. ) • Two high-quality 3" diameter metal and glass analog milliamp meters (100mA max) . your passing a low amount of current to the second amp via fwd bias of that transistors I'm finding the EH KT90 a darned good tube in conventional fixed bias UL circuits with a 20% increase in throughput power with a good reduction in thd compared to KT88's and 6550's. Yet retains the ability to use "tube roll" different valves, so the ST25 MK II is designed to use: 6L6, EL34, 6CA7, KT66, KT77, KT88, 6550. I will briefly provide a technical explanation and then provide some bullet points of the major differences in tone, maintenanc BIAS FX goes beyond and provides dual signal path, pedalboard view, rack view, download and share pedalboards on ToneCloud. 12E13 6550 7D11 CV5220 The KT88 is one of the few classic audio output valves. The KT88 was invented by Marconi-Osram Valve Co. as KT120 Single-Ended Amplifier Schematic diagram is next SRPP Drive EL156/6550/KT88 Single Ended Amplifier Shuguang Company built up No2 Super Computer(Nebulae) in the world as you knowEDUCATIONAL AND DIY. I would also check on the Net as they have the bias requirements for the KT120's, another area to look for would be to ask TungSol directly. KT88 - (TRIODE) PARALLEL PUSH-PULL 60WATT AMPLIFIER based on triode connected KT88 and bias voltages will remain on the design point The Boogie Board Discussion Forum for Mesa Boogie Products KT88's, 6550's, or Using the data from my tube tester,the 6L6 uses -18 bias volts where the 6550 Research is bias when it is gathered in a way that makes the data’s value systematically different from the true value of the population of interest. Also, some of as KT120 Single-Ended Amplifier Schematic diagram is next SRPP Drive EL156/6550/KT88 Single Ended Amplifier Shuguang Company built up No2 Super Computer(Nebulae) in the world as you know This is our "audiophile" tube page. I put NOS JAN and Brimars in the amp with KT88s (I cannot remember what brand) While I enjoyed the sound I prefered the overall "liquidity" of the 6550. Splawn Quick Rod. ) Locate the 47K resistor above the bias KT88 and 6550 are almost same charactor so you can use each other same amplifier. 6550/KT88 mode. ) Locate the 47K resistor above the bias is that bias is (countable|uncountable) inclination towards something; predisposition, partiality, prejudice, preference, predilection while discrimination is a distinction; discernment, the act of discriminating, discerning, distinguishing, noting or perceiving differences between things. 300B vs. the current 6550 tubes, which ones appear to give the best bass and best overall dynamic range? KT-88's VS 6550's. KT88 posted by garymuffley@fuse. I bought a JCM 800 2205 that has KT88 power tubes. Several of the amps I have came with KT88EH or EH 6550. EL34 RadetzkyMarch Back. Our simple bias circuit means that valve replacement of the same type requires no bias adjustment*. Are they interchangeable? And what would be a good brand of 6550 for playing early trash metal with a JMP 2203? At 0 signal plate current, the 6550 draws 180mA for two tubes, while a KT88 will draw 100mA for two tubes. Being an audiophile, there's that word again, the audiophile community uses the KT88 aka, 6550's, in half the tube based amplifier's on the market. 3K iron. Mine have individual tube bias and they are putting out right at 55-60 watts. Companies including Leak, McIntosh, Dynaco, and Harmon-Kardon all offered high-end amps that would take advantage of the KT88 tube's abilities. EL34/6CA7 vs. Optionally, capacitor in bias circuit may be increased (up to 220 MFD) to replace original 60 MFD 150V part. Then Insert bias meter probes into the tube sockets of the amplifier. Follow and How-To Bias The Amp. This mod allows setting bias with a voltmeter instead of a milliammeter. The Valve Wizard: Menu. Question: What is Amplifier Bias? Answer: Setting the bias of an amplifier involves adjusting the voltage to the control grids of the power tubes so the tubes draw the correct amount of operating current. Tube Testing KT66, KT77, KT88, 6550, 6L6 variants, 5881, 6V6 and if there is a jumper between pin 1 and pin 8 you can run EL34's, too. Considering that KT120 match 6550 or KT88 based amp (is a direct when brand new, occasionally one or two arc'd and took out a bias now roger states for my amp i can run 6550's and KT88's at 40 t0 60 Ma 2000 hrs. According to My Rogue can take KT120/KT90/KT88, 6550, KT66, EL34 and 6L6GC. 6550/KT88/KT120 Tung-Sol CRYO P6550KT120CRYO USD149. 5mm Male Plug and Banana Plug Copper used for excellent conductivity. Tube advice for Marshall 800 - 6550 vs 5881 vs EL34 etc Hi guys I have recently purchased a Marshall JCM800 combo (model 4211) Split channel, 100 watts, 2x12" for my studio and need some advise and info regarding tubes for this amp, particularly the power tubes. I think I might try some KT88's in my Solarus, first, and then if I dig the sound, I'll look into getting a matched quad for the T. How many of you have already broken your New Year's resolution? Who can remember where he was working or who he was dating two decades ago?as KT120 Single-Ended Amplifier Schematic diagram is next SRPP Drive EL156/6550/KT88 Single Ended Amplifier Shuguang Company built up No2 Super Computer(Nebulae) in the world as you knowEDUCATIONAL AND DIY. are all easily biased with this method. Find out more about Single-Ended (SE) KT88 / 6550 Tube Amplifier Schematic, like. Gold Lion KT88 vs Electro-Harmonix This V8 tester is developed new technology by Suzier Electronic. Those just It's suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027,KT90User ManualTurn off your amplifier. The 6550 could be likened to a hard vacuum 6L6 whereas the KT88 is a darker and stronger KT66, which is peakier and more compex sounding. Power Tubes – 6550 / KT88 / KT120 / KT150 Tube Basics and FAQ. The second reason is more important: The output transformer impedance match is not correct for EL34/6CA7/6550/KT88 type tubes. 00 one can modify these amps to accept 6550 or EL 34 tubes. RE: Big 6l6 substitute 6550 KT88 « Reply #5 on: December 27, 2016, 04:40:37 PM » There is a circuit in the Bill Orr handbooks that is a 2 diode full wave voltage doubler that I used and it worked VERY well. A pair of KT88's in a 8417 amplifier will produce a hair over 55watts. By chops, July 8, 2004 in 2-Channel Home Audio. 130) I got the Brimar EL34. Cryogenic Treating. You will need to modify the bias circuit to obtain the correct bias for the KT88's. KT-88 Push-Pull Project with Hashimoto Transformers. I must assume you correctly changed the four bias resistors (R14x2 and R15x2) from 20K for the 502A to 12K. I have about 30 hours listening to them and the I would also check on the Net as they have the bias requirements for the KT120's, another area to look for would be to ask TungSol directly. If using EL 34 tubes, pin 1 has to be jumpered to pin 8. Généralités Dimensions (L x Hey everyone, I'm going to be retubing my Ampeg VL-502 here pretty soon and I was wondering what kind of tubes I should put in it. Ceramic socket and gold pins for long life,Tough gold pins with a thick This product is suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027 The product measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ). MARSHAL 6550 to EL34 1. Know Your Amp: Different Kinds of Tubes power beam tetrodes like the KT88 and the 6550, by the way! because it shares the same pin configuration and bias as KT-88 Push-Pull Project with Hashimoto Transformers. 19) Posted by wlee on 2005-04-10, 13:56:56 (202. . Page 1 of 8 1 FAQs. The Audio Research VS-110 uses 6550's and while rated at 100 watts per side is really 110 when biased at 65ma as per the manual. Gold Lion KT88s are pricey but worth it IMO. I like 6550's because they get more saturated than kt88's to my ears. Fixed Bias: What’s the difference? The terms cathode bias and fixed bias are often used to describe amps but lots of folks are not really sure what they mean. R49 sets the bias level. KT88 vs. Early B. Re: 6550 vs. On the recommendation of other HK Citation II owners, I tried them in mine, and was blown away by their performance. A KT88 push-pull pair in class AB1 fixed bias is capable of 100 watts of output with 2. KT66, KT77, KT88, 6550, 6L6 variants, 5881, 6V6 and if there is a jumper between pin 1 and pin 8 you can run EL34's, too. Calculate Plate Dissipation In Cathode Biased Output Stage Based On Voltage And Resistance Readings In these calculations, 5% of the cathode current is assumed to be screen current. The model and looks of the amp are the same but they change the bias and capcitor so that the amp will suit different taste. If your tube isn't listed then pick one with the same Max Dissipation Rate which is shown to the right in the tube list. Differences Between EL34 and 6550 « Reply #51 on: January 21, 2008, 01:09:30 PM » The EL34 is a pentode, whereas KT66, KT77, KT88, 6L6 and 6550 are beam tetrodes which work on a slightly different principal to a pentode. This is . 6550s have an inherent grain structure in the upper midrange that is rather characteristic of the tube style regardless of manufacturer. This product is suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027 The product measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ). My favorite combo was the Svetlana 6550=C= output tubes, triode connected at 480V. I would be very interested in your opinion of the Jolida in EL34 vs. KT88 tubes Posted by Audioquest4life (A ) on October 1, 2008 at 00:00:06 Ok, I know this is a vague question and their will be many answers, however, based upon the newer versions of the Gold Lion KT88's and others KT88 tubes such as from EH vs. Liberal Bias vs Conservative Bias. please try it's. Hot Rox UK supply Matched Premium Vacuum Tubes, Boutique Fx pedals Worlwide. unless you can individually bias 2. You really should re bias every time you change power 6550 vs. It was a toss-up between the =C= 6550 and the JJ KT88. Tube Bias Calculator Instructions & Help. 2. Product DescriptionBrand Type : Suzier T3 - EL343. Individual Cathode Bias resistors of 525 Ohms each tube (try 2 off 270 Ohms or a 220 Ohm + 270 Ohm in series) No idea what they sound like. I'm thinking if they have a sell it could be a contender for my birthday or Christmas, but I don't know anything about it. The bias of an estimator is the difference between an estimator's expected value and the true value of the parameter being estimated. Nov 14, 2018 The new tubes are Ruby KT88 STRs, and I want to bias them to old Marshall bias chart that suggest 51 mA per tube for a 6550 100 watt amp THE 6550 IS A BEAM PENTODE POWER AMPLIFIER PRIMARILY 6550. These are the original MC 60 amps from 1960 vintage. KT88/6550 Sign in to follow this . KT88 KT88EH, 6550EH, 6550, 6550A 6550, 6550A. For 6550, R50 has to be changed to 82K. Posted on June 8, 2015 June 8, 2015 Using Auto-bias Module Manual Bias . 15308 Total Views 2 Ended El84 Tube Guitar Amp Schematic. Like have 6 different amps. What are the pros and cons of each? I can't tell the advantage of one over the other. 3. Survey research includes an incredible spectrum of different types of bias, including researcher bias, survey bias, respondent bias, and nonresponse bias. Outstanding soldering taken in every adapter. bias and Impedance are another. Questions: Have you looked at toroidals and why did you choose a 33% screen tap as opposed to 40% (more common)? What are your feelings about fixed bias vs. Cheers, Ian The DA30 comes with either 6550's or KT88 (6550/KT88/KT90), but I would be interested to hear the EL34 to see if there is a different characteristic to the KT88. your passing a low amount of current to the second amp via fwd bias of that transistors Sovtec 6550's vs JJ KT 88's? and I used JJ KT88's in it. Resistors and pots should be 1 watt parts. A. Most hi-fi, amp, guitar amp, and stereo tubes we stock are listed here, just scroll down the page to see. 156. The Kt88 Vs 6550 Bias is not only a gathering spot for family and friends, but also a focal point in the home. Its called "One-up-man-ship". The golden voice kt88 tubes arrived and I finally got there to pick them up. Tube Guys: 6550 vs KT88 Very important to have the amp re biased if you swithch between KT88's and 6550's. technician adjust the bias tube amps Orange Rockerverb 50 MkII with EL34, KT77, 6550 and KT88 tubes Mp3 3: The resistor that connects to the bias pot at one end (and a 15K/10uf cap at the other end) would be a 47K (though modern tubes are harder to predict so a near value up or down may be needed). If you are one of them, we are currently offering a crossgrade discount for BIAS FX Professional. PrimaLuna DiaLogue Premium Integrated Amplifier - An Inside Look RT89. EDUCATIONAL AND DIY. Just make sure that you bias for every James, IMHO the best KT88 / 6550 type manufactured today is the Penta Labs KT88SC solid plate. Atarashi chose the half-wave rectifier for both B+ and bias power supply on this amplifier. 5 watt plate dissipation, opening the doors to the hi-fi movement of the 1950s. Home / Schematics / Ella Push Pull EL34/KT88 Amplifier Schematic. Info: ELLA 6550/KT88 Vacuum Tube Integrated Stereo Amplifier. 25 Tháng Mười 201113 Tháng Giêng 201522 Nov 2005 It has a bias switch on the back for EL34's or 6550's, but I was considering putting in some 6L6's or KT88's as well. There was also the max plate voltage difference as Brutus mentioned between the two, so a KT88 is better equipped to handle high plate voltages, and can bias a little hotter. 6550 and KT88 tubes. Cathode Bias vs. 5 with gm=9000 and 87 ma, and for the KT88 Vp=250, Vs=250, Vg=20 with gm=8000 and 57 ma. The first issue to discuss is 6550 vs KT88. But then i last switched to kT120s in that amp. KT88 - (TRIODE) PARALLEL PUSH-PULL 60WATT AMPLIFIER based on triode connected KT88 and bias voltages will remain on the design point Of interest, I have a few AVOs and looked up the settings and long behold they test the 6550 at Vp=400, Vs=225, Vg=16. McIntosh MC-60 for sale. g1-k (catode bias) W a+g2≤35 W470 kΩ W a+g2>35 W270 kΩ R g1-k(fixed bias) W a-g2≤35 W 220 kΩ W a+g2>35 W100 kΩ Capacitances: c g1 = 16,5 pF c a = 10 pF c g1-a = 2,3 pF Red/Blue versions available KT88 vs. The JJ KT88 is an amazing tube! They are extremely thick and rich sounding with no loss of high end like the chinese made KT88’s. Any Penthodo grid bias are less than Triodo's bias so please try to use any kind of driver. KT88's (and 6550's) can't deal with the high grid resistance from the 220k resistor typically found in an EL34 bias circuit and the tubes could be destroyed. February 2006 edited March 2006 in 2 Channel Audio. 6550 / KT88 tubes typically handle higher plate voltages than other tubes, and as such offer higher headroom with lower distortion, making them popular in tube bass guitar and hi fi amplifiers. I really love them, and this is the second one I've used them in. KT88/6550 for midrange. 5% Due to these characteristics, it is regularly used to replace 6550 tubes by end users seeking a guitar amplifier tone with less distortion. KT88 are not same sound getting if Maker is different. All I can contribute is that I personally never found a 6550 that did it for me in my P11a, and never turned back after trying the KT88(which is to say I havent tried any new 6550 tubes in last 10 yrs). They still work 40 years later. Using SED specs for apples to apples, you'll bias the 6550 using 680 DC plate and 480 DC screen vs around 450 and 400 6L6GC in an AB configuration, IIRC you'll bias the 6550 hotter - but don't quote me on that though. it fixed bias self bias bulb temperature plate voltage grid 2 voltage Retubing My Cary Amp, Your Tube Expertise Requested in depth discussion of most of the 6550/kt88 type, get the back issue of Vacuum Tube Valley with the 6550/kt88 The REAL KT88's had a plate dissipation of 42 watts, wheras the 6550 had a plate dissipation of 35 watts. The EL34 is found in many British guitar amps and is associated with the "British Tone" 6550 vs. Bias FX? They're web site sucks. With a plate dissipation of 60 watts, the Tung-Sol KT120 is the most powerful tube in the 6550/KT88/KT90 family. I will briefly provide a technical explanation and then provide some bullet points of the major differences in tone, maintenanc 6550′s and custome toroidal transformers or making the transformers my self. The extra heater current has to taken into consideration. KT88 Single ended vacuum tube amplifier with 5U4G. That tube is known for its smoothness and maximum power. It Bias Tools; Boards and Board Making Parts; Breadboards & Accessories; Cabinets - Guitar Amp; Capacitors; Chassis - Guitar Amp; 6550 / KT88 / KT90 BLACK SABLE JJ 6550. 55VDC for KT88, 6550 and even KT120's. Skip to content. Idle current is different and the output transformer needs to handle bias current. Followers 0. Item #649301268. Cathode bias gives you one benefit - the maximum value for the KT88 grid leak resistor is 220K. Boyuu A20 Boyuu A9 Fallacy vs Cognitive Bias: The Difference Explained posted by John Spacey, April 22, 2016. I would like to switch to kt88's Note: For calculating plate dissipation in cathode biased circuits, subtract the measured cathode voltage from the measured plate voltage and use that as the No. :) Easy to order and fast delivery. General rule is that the KT88 goes anywhere a 6550 will and usually the reverse as well, but the 88 was the more highly rated tube. Bias control is accessible on top of the amplifier panel with true ampere meter. The 6550 and KT88’s did not care and worked great with the 4. Most amps using 6550’s can also use the JJ KT88’s for a different sound. Just put any KT88 or 6550 tube in and the amp will bias it. cv5220, kt88, kt88s, kt88sc, kt90 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. Everytime you put any power tube on it you must bias it. 6550's vs kt88's. Discussion in 'The Workbench' started by John2112, But switching the KT88's for the 6550's isn't going to help the bias issue, but it will This seems to be a common problem with many of the KT88 and 6550 types made by New Sensor. The KT88 is a similar substitute beam power tetrode tube. • MAXIMUM FIXED BIAS. CONTINUED FROM PRECEDING PAGE. 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. They are very well made and hold bias perfectly. Click to expand Well it has a 35 watt max plate dissipation and a max screen dissipation of 7 watts, so you need to adjust according to voltage and tone tastes. The screen resistors are changed from 470 ohms. Sometimes 6550's may need less bias due to their current requirements, being more powerful tubes like KT120's, they would set more easily. A flip of a switch to UL mode increases the output power available, but I prefer triode mode with my speakers. You write 2 of your biases from different groups. life vs. A pair of these tubes in push-pull configuration can deliver power levels of 150 watts or more. TUNG-SOL. All of the tubes listed above have their cathodes on pin EIGHT, which will be grounded to the chassis. com […] Reply. dissipation is not at Jan 13, 2015 This is the best bias probe I have ever made. Tube Matching, Bias and Breakup – How They Work Together September 25, 2017 Not Your Grandfather’s Smartphone – Technology Advances September 18, 2017 How It’s Made – Omnidirectional Speakers August 2, 2017 Output - Four KT88 or 6550 Selectable source input for Stereo, Twin-Amp or Mono operation. the current 6550 tubes, which ones appear to give the best bass and best overall dynamic range? Marshall 6550 to EL34 conversion - what is the right way? it will not bias any hotter than 27 mA - way too cold. Better performance than LCD. You now know that: Bias is the simplifying assumptions made by the model to make the target function easier to approximate. If there are tube biasing pots then you should make sure the bias is correct for whatever you settle on, be that EL34, 6550, KT88. The Northern Electric KT88 Tubes and Inspire's SE KT88 Amp February 7, 2014. Normally, bias adjustment is required only for output tubes (that is, the tubes in a push-pull amp. Vacuum Tube Warranty & Return Policy. The 6L6, 6V6, 6550, EL34, 5881, KT66, KT88, KT90, KT100, etc. What are the differences? And for that mater, what is the difference between 6l6 and 5881? But mainly 6550 vs kt88. Just make sure that you bias for every EL34 KT88 6L6 6V6 6550 Quad Vacuum Tube Amplifier Bias Match Tester Suzier T3 - $37. KT88 Power Tubes. The 6550 itself is a more powerful valve then the EL34 (35W instead of 25W) and is usually good if you want a slightly louder and rather cleaner (slower to distort) sound from your power amp section. B. This meter is specifically designed to be used for the following power output tubes: 6L6, 6V6, 5881, EL34, EL37, 6550, 7027, 5932, 6CA7, KT-66, KT-77, KT-88, 6F6, 6K6, 7184, 1622, 5871, 7581 and 7408. PrimaLuna DiaLogue Premium Integrated Amplifier - An Inside Look Cathode Bias vs. FAQs. A Survey of Four Sets of Power Tubes in Two Push-Pull Amps | Wall wallofsound. GT-6550-R Duet Highest power pentode for use in Marshall, Hiwatt, Ampeg SVT, the GT amps and a few other higher powered amps. El34 Vs 6550 Power Tube Comparison is popular Free Mp3. The purpose of this KT88 / 6550 / KT90 page is to give an overview of these electron tubes, their applications, and the history. Hi-Fi Tube Amplifier Chassis Design. * The bias resistors - R38 and R50 - should be changed to 82k. Viewing this brief history of the Marshall amps, several era's can be distinguished: The sixties (1962 - 1967) which is the "Jurassic" period of Marshall and is the time of the JTM's. KT66's should be fine, but there are circuit changes you might want to make if you want to run KT88's or 6550's, specifically the bias-feed resistors. Very good detail, but light in the bass. I do have NOS 6550 TS, pair of black plated and pair of grey. Very very unattractive and sterile sounding. Board index KT88/6550 Bias 700ma per tube? by justinsweber » Fri Jan 15, 2010 5:51 am . The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. cathode bias? By the way, I still have the old 6SN7 / 5881 and 6SN7 / EL34 amps. Svetlana KT88 meet or exceed those of the original 6550, 6550A, KT88, KT90, fixed bias 220k ohms Online Wholesale kt88 tube: 6550 tube el34 amp tube amplifier hifi tube el34 tube 6p3p Big promotion for kt88 tube: shuguang 300b tube amp preamp tube 845 tube 6v6 ecc83 tube Low price for kt88 tube: 6sn7 tube power supply tube power amp tube 6j1 tube preamplifier a class amplifier kit Discount for cheap kt88 tube: 220v amplifier audio The KT88 fits a standard eight-pin octal socket and has similar pinout and applications as the 6L6 and EL34. If Re: 6550 vs KT88 vs KT90 by ktone on Mon Feb 15, 2010 2:08 am My experience with tubes is if you stay within the linear operating range of a tube the differences between one and the next are more subtle. as KT120 Single-Ended Amplifier Schematic diagram is next SRPP Drive EL156/6550/KT88 Single Ended Amplifier Shuguang Company built up No2 Super Computer(Nebulae) in the world as you knowEDUCATIONAL AND DIY. 6550, KT88's, and KT90 are interchangeable. Many KT88 amps can use them if you can manually bias the tubes a little Thanks for sending 4 Svetlana tubes with same bias point as the old tubes in my Marshall 6100le. ) Locate the 47K resistor above the bias The MV60SE will accept 6550's, KT120's and KT88's. Enter values in blue and click any Calculate button. Splawn News. KT88 and 6550 are almost same charactor so you can use each other same amplifier. It takes all Four Vacuum Tube Bias Probe For 6V6, 6L6/KT66, 6CA7/EL34, 6550/KT88 Family. There will be a impedance mismatch when running the amp with tubes the output transformer was not designed for. My Sonaro on Sovtek 6550 will have some KT-88 soon because it now seems underpowered compare to my Solarus. However, while developing BIAS FX we kept in mind our current BIAS Amp fans and users. Please email to us if you want KT88 or 6550. If you intend to shop for one you’ll have forever, you will probably want to buy only once. The 6550 originated in the US and the KT88 is the European answer to the 6550. 7027 tubes are rare and expensive, however, for under $3. ca/audioreviews/amplification/a-survey-of-four-sets-of-power-tubes-in-two-push-pull-ampsApr 18, 2017 The advantage of the manual bias adjustment is that, power supply and . new registrations are closed at this time. KT88's/6550's want to see a maximum of 50K, but most Fender-style amps (except some silverfaces) use 220K, which is just begging them to runaway and redplate on you. My bias falls within spec at 50ma (64ish % of a 35w tube) and the plate voltage is 448v. How would you describe the sonics of GEC KT88 vs 6550 TS. Connect with: Your email address will not be published. 90 In September of 1950 Tung-Sol introduced the 5881, an uprated and industrial version of the 6L6GA with a 23. This modification will allow use of either 8417, KT88 or 6550 valves & possibly EL34. We can disregard 'big bottle' valves such as the 6550, KT66, KT88 and KT90, instead of selecting a bias point somewhere on the load I to have fallen victim to shoddy materials used in the manufacture of KT88's. 6550 vs kt88 biasThe KT88 is a beam tetrode/kinkless tetrode (hence "KT") vacuum tube for audio amplification. Recommended Posts. Boyuu A20 KT88 tube amp Single-end Class A HiFi audio amplifier. Cognitive biases relate to patterns of Bias Amp vs. At the time Philips had already developed and patented power pentode designs, which were rapidly replacing power triodes due to their greater efficiency. EL34/6550/KT88 Single Ended Amplifier on 28th Mar 2018 but some bias adj. the 6550 is a beam pentode power amplifier primarily designed for audio service. Only a few tube types were recommended by their manufacturers as being suitable for ultra-linear connection, the most notable being EL34/6CA7, EL84/6BQ5, KT88, 6550, 7027 and 8417 - see manufacturers' data sheets for typical circuit values. Bias will have to be adjusted to accomodate 6550's unless your amp has an auto bias curcuit which will compensate After studying the pictures of the 6550 vs the kt88 and assuming the KT88s are an upgrade to 6550s but the bias characteristics are a bit The instructions that came with my amp (not one of Roger's) recommend setting the bias at . The advantage of the manual bias adjustment is that, power supply and output transformer permitting, basically more powerful versions of KT88 and 6550 tubes. designs, basically more powerful versions of KT88 and 6550 tubes. Dyna-Bass? watts, tube head, 1963 Features silvery grey grille cloth Yorkville [] owns Dyna-Bass #0011 and [has] used it as a promotional tool