Kt77 vs kt66. A KT66 is the closest relative in the GEC family.
Kt77 vs kt66 Sep 1, 2014 · This developed in collaboration with RCA and so RCA essentially marketed the 6CA7 and MOV marketed the KT77 through GEC. EL34 Review Chart (View our complete selection of EL34 / 6CA7 / KT77 vacuum tubes) Test Amps: 1973 Marshall Super Lead model 1959: This amp is completely stock using NOS pre-amp tubes. Don't get me wrong, I think the KT-88 EH (as an example) is a VERY good tube. Sep 3, 2010 · by selloutrr » Fri Sep 03, 2010 3:51 pm the tube substition hand book is a nice reference for which tubes cross and substitute. 0 - KT77 vs 6L6GC vs EL34 vs KT66 Ryan Kiesshauer 5. Comparing 5881 Tubes vs 6L6 Tubes When it comes to 5881 vs 6L6, they are mostly interchangeable, but there are key sonic differences. Dec 3, 2012 · Discuss questions about tubes and gear that glows on Tubes Asylum. Best tubes for jazz and acoustic stuff with female voices by far is EL34. Unless you're amp can take EL34's you probably can't use KT77's. Sep 27, 2015 · In an amp that can use either of those, can someone describe, in general, the differences in sound between them if used in the same amp. Upscale KT77 Gold Lion 金獅KT88 Blue JJ弦樂及人聲進行兩隻真空管(膽管)比較Comparison of orchestral and vocal music between two vacuum tubes Cosmetically, the EL34's glass is a little bit shorter than the KT77, and it's a little bit fatter. KT 77 vs. Some people like this effect and possibly some don't. The same pinout does not necessarily make the tubes the same. I have an impedance mismatch and I need a tube with the highest impedance load requirement. We research what we know. Feb 12, 2018 · Thanks to an advanced auto biasing system, they can work with 6L6G, 6L6GC, 7581A, 6550, KT66, KT77, EL37, EL34, KT88, KT90, KT120 and even the very powerful and currently very popular KT150. Tough choice. I think 6L6CG>KT66>EL34 but I don't know where KT77 is positioned. My KSR PA50 has 6L6GC tubes in it. Both played in the same amp. (Primaluna EVO 300 @ Prologue Premium power amps. Some mods are required for an EL34 amp to run 6L6s but it can be done and many amps like the Randall you mention or some Mesa Boogies can take both with the flick of a switch. 6L6, 6L6G, 6L6GA, 6L6GB have the same ratings, but different bottles 19w plate diss, 375v plate vmax, 0. A KT66 is the closest relative in the GEC family. Compatible types like the 6V6 and KT66 or even the KT77 can be used in certain amplifier circuits and offer different sonic profiles. You can use 6CA7 or KT77 in place of EL34. Feb 27, 2007 · Use a 8k primary output transformer with kt66 tubes 784-128 output transformer is for el34 in the jtm 45/50 or jtm50 (3. When comparing the 6L6 vs KT66 vacuum tubes, you’re diving into the heart of guitar amplifier tone. be/W6Lm2R4o3dAA comparison between amp tubes at clean amp settings -- 6L6GC / 5881, 6v6, KT66, KT77, and EL34 tubes all i 6L6GC, 6L6GB/5881 and KT66 Tubes Different Power Ratings While all 6L6 types are pin compatible with one another, some amps are designed only for the higher powered 6L6GC. Mar 8, 2007 · I know KT77's can be used in substitution of EL34'sbut the others? and what are the tonal differences? Thank you. ). modern tubes Bob Gjika (Luthier & Amp Builder) 2. Discover the differences between EL34 vs KT88 vacuum tubes in this basic guide. Personally, I've really enjoyed the JJ KT77s that I've used in EL34 based amps. I'm thinking of getting some KT66s, thinking that lower powered tubes are better (to my ears) matches for my system. The EL34, EL35, and EL37 were all pentodes, like the 6L6 family, but weren't quite as electrically interchangeable as the KT series tetrodes. I would probably go with the KT77 but have never directly compared them. a KT66 is rounder, warmer and more 'high fidelity' sounding to my ear than an EL34/KT77 assuming all things are equal. Electrically, they are the same. Aug 8, 2023 · I have sold off my KT 150s, and use KT-88s from time to time, but what I really love are KT77's. But on the basis that lower power tubes generally produce more faithful sound, can one put KT66 tubes in an amp usually requiring two KT88s per channel? I'm thinking about a pair of Quad II/forty push-pull monoblocks. . Apr 29, 2013 · The KT66 is simply a replacement tube for the 6L6. These tubes are NOT as dependable as the Mullard EL34. Confusing is an understatement LOL Apr 5, 2017 · EH 6CA7 vs JJ KT77. A special focus: a set of KT66 and KT77 tubes from Genalex Gold Lion Apr 19, 2017 · The Aikido/Elekit/KT77 combination got darn close to the Aikido/Eiclone/KT120 combo described above but in some respects I think the KT77 was slightly better. Modern production is limited but they are currently produced in China (Shuguang), Slovakia (JJ Electronic), and Russia (Svetlana and New Sensor). Jan 7, 2018 · I’ve been happy with the new production Russian Gold Lion output tubes. If you do a variable cathode bias circuit you can swap out the power tube with whatever suits you 6V6 6L6 5881 KT66 KT77 EL34. The KT88 draws slightly more heater current, and I'm not sure if the Marshall PT will support that draw. A delightful tube. Nov 4, 2008 · i had asked both eurotubes and tubedepot about this. They are all burned in before testing and matching. Base, internals, micas and spring clips are virtually identical. Second, in my experience the Gold Lions will require more negative bias voltage than the Dynaco may be able to provide, so they might be difficult to bias without modifying the amp. (8k primary) The 128 makes it a 67 jtm50 or 45/50. It did take a little time for them to break in. To my ear these tubes have the glorious mids of a EL34 combined with the tight bass of a 6550, and sweet yet It's stated in the original Dyna ST70 manual that KT66 can be used in place of the EL34 output tubes. After the Mullard patent ran out, the 6CA7 and the EL34 were used pretty much interchangeably. Jan 21, 2010 · The scooped midrange you hear in 6L6GC's, 6CA7's and 6550's was something the British called the "midrange kink" and they engineered tetrodes that were "kinkless" for better hi-fi amp sound reproduction. kt77 tubes also are more dynamic in sound and suffer from Jun 1, 2021 · I never paid much attention to the various tubes out there. Apr 2, 2020 · Very promising but the emphasis is completely different than the KT66. Maybe I need some different EL34s. tubedepot told me to steer clear of these, probably more tonally than electrically. kt66 (power): Jun 6, 2008 · No. 6L6WGC – A military-spec tube, durable and reliable. The EL34L is an EL34 with a bit more power, the KT77 is a beam power tetrode instead of a pentode. Set your bias Nov 5, 2025 · 2. The closest Mullard made in England would be the KT66 and KT77. Jan 1, 2017 · A real EL34 is a pentode tube, vs. Back in 1956 GEC introduced the KT88 as a larger variant of the KT66. 0 - KT77 vs 6L6GC vs A comparison between amp tubes at dirty amp settings -- 6L6GC / 5881, 6v6, KT66, KT77, and EL34 tubes all in the same amp with Dec 10, 2023 · EL84, 6BQ5 pentode (RCA 6BQ5's can be pentode or tetrode) 7189 military 6BQ5 KT88, 6550 tetrodes and similar KT66, 6L6GC, 7581A tetrodes and similar KT77, 6CA7 Tetrode, EL34 Pentode similar I thought the 6l6gc looked exactly the same as the kt66. Perhaps you’ve read a ton of articles about the difference between power tubes and what they do to our sound. The transconductance of the 6L6, KT66 are not similar to the KT77. Not including the lower power octals like the 6V6 family which we know to be good - just those with dissipation of 18W or over Aug 27, 2013 · KT 66 or NOS EL34 I have a modified Dynaco Stero 70 amp from Will Vincent that accepts either KT66 or EL34. It’s a reliable tube that offers sonic sounds with excellent dynamic detail across a broad audio spectrum. 4K subscribers Subscribe Apr 19, 2017 · The amps can run EL34, 6L6GC, 5881, 350B, KT66, KT88, 6550, KT90 and more (some tube choices require a 5U4GB rectifier tube)" FWIW, the KT88 is not my favorite output tube. com in the Core Projects/Building Blocks. They smoke the original Shuguang EL34's that came with the amp. I decided to do some tube rolling and purchased a quad of At Eurotubes we are all players who understand amps and tubes, we are not refugees from the corner pizza joint, we’re not suits behind a desk. Dec 27, 2009 · The two red jacks represent each tube's "positive" reading point and the "common" reading point in the middle is black. Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums So today, I'm going to compare the 'standard' JJ KT77 tubes with some Genalex Gold Lion reissues. I heard some details which I hadn't heard before, yet it was in the lower mids /upper low frequencies. MC7150 Aug 9, 2024 Tube Audio Replies 7 Views 966 Aug 10, 2024 Aug 6, 2014 · **Updated video here: https://youtu. I have tried the GK reissue KT66's (nice tubes, but somehow I prefer the midrange magic I get from nice NOS el34's in my amp, like Amp/Mullard and Tesla brown base el34's). The KT88 was by far the cleanest and flattest, but who knows, maybe that particular tube had a clean rating. Kt66's on the other hand will work and what you'll hear is the sweet mids of an EL34 combined with the tight thump of 6L6's. We have spent thousands of hours researching every amp we can get our hands on, documenting what types of tubes an amp can safely use, what works for different styles, bias info, etcetera. IMHO , if you can run the GL- KT66, vs the KT77, I would try that. KT66: Overview Whether it’s on a radio amplifier or one made specifically for musical instruments, the KT88 tube amp is the go-to option. Mar 31, 2020 · A common tube replacement question is whether the kt77 tubes is going to be an improvement over the el34 tubes. It's not always a safe EL34 substitute (it has lower voltage ratings, and very different biasing requirements), especially if run in an ultralinear circuit. It has been a staple in American-made amplifiers and is especially favored for genres like blues and rock, where a clear and strong Explore the differences between EL34 vs KT77 vacuum tubes. These tubes are The Best KT66 Power Tubes - Reviews and Guide Are you looking for the very best KT66 power tubes for your vacuum tube amplifier? This is the place to start. However you did write in your OP, "For music, I like sharp and crisp top end, full rich bass, and smooth non forward Mar 11, 2018 · 6L6 vs EL34 It was pointed out to me the other day that it would be easy to convert my amp, a stereo PP EL34 amp, to run 6L6's. They claim these tubes are 'artful' and use premium gold-plated components. I want to try some kt66 or kt77’s once it’s time for another set of output tubes. You would assume they would sound identical, but they don’t. My other fav is the TS 7581A. 1970 Marshall Bluesbreaker 2x12 combo, Class A Combo: Designed and built by Bernard Raunig. Oct 28, 2010 · A KT66 in a stock ST-70 usually brings out a little more top end that was missing with the stock EL34 tubes. Feb 1, 2017 · A tube has broken, and thinking of a new quartet I have heard that the kt77 have a similar sound improving the treble. When you replace your 6L6, you should make sure that you replace with the right type. I used a set of 88's, but wound up putting the 77's back in. The DSL100 will only run EL34 or KT77 stock, IIRC. Watch the maximum ratings of the tubes. 1- Both using EL34 output tubes. This is why you will see tubes with both designations. That can get expensive as my Primaluna Dialogue HP Premium integrated has 8 power tubes. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. Jul 8, 2017 · Old thread- I know. Aug 30, 2014 · A Mullard 520 circuit can be easily modified to accept KT66 tubes if you want something that might sound better (to you) than an EL34, they're another great tube, especially, like the Mullards, if you you get vintage made in UK versions of both. but i'm only trying to provide proof that the tubes are electrically suitable in the v, so that said, eurotubes answer seems to back this up that the kt77 is suitable. Power Tube Comparison! New VS Vintage (NOS) KT66 Gold Lion VS GEC. More highs and lows, clearer mids. Thank you! The previous owner of this amp had it running on 6L6's, but I wanted to restore it to being powered by the original KT66 tubeset. 2- The driver board should be of similar design while using NON 7199 driver tubes. the KT66. COuld someone tell me the tonal differences between the two brand of tubes? Th Nov 25, 2019 · Bonjour à tous, Bonjour Francis, J'aurais une petite question à l'expert incontesté que tu es en tubes après la lecture du post D'Egeswald "EL34 / 6CA7 / KT77" Sep 10, 2008 · Gold Lion KT66 vs Gold Lion KT77 - easyliving - Tubes AsylumGold Lion KT66 vs Gold Lion KT77 Posted by easyliving (A) on September 10, 2008 at 12:38:07 The recent introduction by New Sensor of the GEC Gold Lion KT77 replica has put in the arena a great competitor for the GEC Gold Lion KT66 replica, produced at the same plant in Saratov. Aug 20, 2008 · The KT66 is a killer, and while the KT77 results are just starting to come in, so far the reports have been superb. Finally, in general I take The quick answer to the difference between EL34 vs 6CA7 or EL34 vs KT77 is simple. Dec 20, 2016 · Do certain output tubes have specific sound qualities inherent to their structure? for instance how do KT66's sound compared to KT88's or KT77's? how do EL34's sound in comparison to 6V6's and so on. Doable, or am I asking for trouble? Jan 25, 2023 · EL34 vs KT77 The KT77 has higher plate impedance (23k) compared to the EL34 (15k). Ther's someone who had occasion to compare them? what In this video, I compare four of the most popular power tubes for hi-fi and tube amplifiers: the EL34, KT66, KT77, and KT88. The KT 88 tubes are often used to make more vacuum tubes due to their great sound reproduction. 9A (original tube in Heath W2/W3/W4) Jan 13, 2009 · Last spring I purchased a restored Leak Stereo 50. Sep 19, 2019 · The tonal differences between the 6L6 and the KT66 are ambiguous. Même si les tubes d'origines m'ont donne grande satisfaction au debut, apres deux ans d'utilisation moyenne ils se sont tres vite essoufflé pour finir par Jan 12, 2010 · The KT77 isn't really a direct substitute for a 5881 - it's really a EL34 congener. Thanks May 13, 2024 · First, the amp wasn't designed for KT66's, which call for a different set of operating parameters and plate loading, so sonic performance won't be ideal, including the feedback loop. The 6L6 tube is renowned for its robust headroom and clarity. A special focus: a set of KT66 and KT77 tubes from Genalex Gold Lion In this video, I compare four of the most popular power tubes for hi-fi and tube amplifiers: the EL34, KT66, KT77, and KT88. Cet ampli permet de recevoir une grande variete de tube - EL 34, KT88, KT66, KT70, KT90, KT100 et les 6550. The default output tubes shipped with the HALO are EL34, but the amp can be biased easily to accept 6L6GC, 5881, KT66, KT77, KT88, or 6550 output tubes. The EL84 is a noval socket power tube, and is not a direct drop in, but you can buy THD Yellowjackets that will allow the amp to run EL84s. I've heard good things about both of these but can't decide which one to use. Sep 4, 2024 · I'm looking for some sonic comparisons between these much-used octal outputs wired in triode. Oct 20, 2012 · KT77 is (with any currently available tubes) like a bit EL34. There just seemed to be a bit more natural, slightly clearer quality especially in the upper mid and high frequencies. Jul 29, 2008 · I'm thinking of replacing the 6L6 tubes in my amp to something that has a slightly bigger sound but has that brightness I like in the 6L6's. I have been very happy with the KT66, but have not tried the KT-77's yet. 5 cents. Oct 3, 2012 · Sound comparison of JJ EL34, EL34L and KT77 in a marshall jmp50W. 9A filament current 5881 = 6L6WGB uprated ~20% to 23w, 400v, 0. Learn about their unique characteristics & how they impact your amp Dec 17, 2013 · Ok, back to the KT88. I felt guilty using such expensive and rare tubes, so I stashed them away and purchased a quad of Electro-Harmonix EL34EH's. Now, with that out of the way, there is a fair amount of difference in how these tubes sound. Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Discover the differences between EL34 vs KT88 vacuum tubes in this basic guide. I continue to be amazed at the clarity, the dynamics, and the overall depth of the sound I get from the KT66's even at volumes that I wouldn't really use. I've been close to buying some of the GL KT77's to try but haven't pulled the trigger yet. Google data sheet for the tubes you are interested in and compare the data. Does changing the types of tubes in a power amp make a big difference? Nov 16, 2017 · Anyone have experience with the Tung Sol 7581a vs. The KT120s seem to lead toward a neutral, solid state sound. a 6CA7, or a KT77 or KT88 which are beam tetrodes, the 6CA7 being the American-made substitute or the EL34 which was a Philips-Mullard creation I think, so the American manufacturers couldn't use the particular pentode construction so they made a tetrode that could substitute directly and tubes of either type Jan 7, 2023 · The KT66 is a 6L6GC equivalent substitute. Can be used Apr 1, 2018 · The original was making all kinds of racket and had a huge turn on jump. Deep, and tuneful bass. OLD RESPONSE The sonic differences between EL34 and KT88 tubes are quite distinct: EL34 Tubes: Known for their RE: KT66 vs KT77 - Chris O - Tubes AsylumChris O In Reply to: RE: KT66 vs KT77 posted by easyliving on September 11, 2008 at 04:42:57: Aug 18, 2008 · KT77's go in place of EL34's, not 5881/6L6's. Some say the KT66 is very much like the 6L6 with minor differences, others say the difference is huge: smoother in the highs, smoother in the mids, more open sounding, better dynamic response… Jun 16, 2019 · What genres best suit KT77 vs. Jun 18, 2019 · Got about 200hr on a set in my Rocket 88 and think they are the best sounding of the small power tube genre that I've tried (T-S EL34, GL KT77, etc. In this article, we are going to compare their differences as well as understand about their history. Can anyone inform ?. It would be best to recheck you quiescent current first. It was a very old production tranny, and the new one is much quieter with no jump at turn on, although it does still vibrate some. Use a bias setting of . You may find you just like el34's better. Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums I eagerly await your comparison with the GL reissue KT77's. That is not saying that your amp will not function with a 6L6, it is just saying that it is optimized for EL34. The great thing about KT88's is because of its popularity and widespread use there's countless NOS and tube upgrades available at real Cosmetically, the EL34's glass is a little bit shorter than the KT77, and it's a little bit fatter. Gold Lion KT77 Notice: We supply the very finest KT77s, and our testing is the best, period. a 6550/KT88 Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Apr 16, 2024 · For me the 'KT' varieties are really sort of in-between variants - which offer subtle variations on their source inspirations - 6L6 > KT66, 6550 > KT88, and EL34 > KT77. Feb 11, 2019 · New Production EL34/KT77 questions Discussion in ' Audio Hardware ' started by gov, Feb 11, 2019. In most cases it will drop right in and bias up where a EL34 had been before. I'm thinking about trying a set of EL34's or KT77's. The VTA sounds best with the KT66's but like crap with EL34's. Doesn't matter what music it's used with or "types of tones" either. Learn how these components impact amp performance & which one is right for your setup Feb 4, 2017 · Hello, asking for help picking some different sounding power tubes other than the KT120s. ) They have a very detailed dynamic sound with a wide a deep soundstage. So I've found JJ KT77 isn't a wise choice to use as a stock tube. EL34, KT66, KT88, 6L6 I broke down and added another power tube (Tung Sol 7581a) to my collection. I recently noticed a slight hum coming from the speakers when no music was playing. Check out the following tube reviews for guidance in getting the best possible tone out of your tube amp. Physically, this Mullard 6L6GC tube is a kissing cousin the Tung-Sol 6L6GC-STR. I have tube rolled some of my amps to use 6L6, KT66, EL34 (connect pin 1), KT88 and KT77. " May 22, 2015 · Hello I need to know who has the highest impedance OT load requirement in SE Triode and linear mode. Jan 8, 2023 · I have replaced the 4 EH EL34's with a matched quad of JJ KT77's. KT66 (6L6GC), KT77 (6CA7), and KT88 (6550). Bob Like Dislike Sponsored content Post n°3 May 31, 2019 · In this article, we are going to take a look at two power tubes that are similar enough to be interchangeable, but which have different internal designs: EL34 vs KT77. Other dealers won't tell you the truth. I have not heard their KT77 but they also get good reviews. KT88 vs. KT66 - 6L6GC - 5881 - 7027 (with mod) - 7581A/KT66 KT77 - 6CA7 - EL34 KT88 - 6550A EL34 - 6CA7 - 7D11 - 12E13 - KT77 - KT88 6L6 - 5881 Jan 10, 2015 · That being said, I never had a KT77 but have 6L6, EL34, KT66 tubes and had a KT88. That’s my 2. The KT 66 tube is known to have a 3D sound, which is pleasant and very clear. KT88 tubes? Discussion in ' Audio Hardware ' started by ProfessorC1983, Jun 16, 2019. Jun 23, 2017 · The transconductance of the 6CA7, EL34, and KT77 are very similar. Depending on the amp I like different things. It never really gain much popularity or see large scale production so it is rare to find a guitar amplifier designed RE: KT66 vs KT77 - easyliving - Tubes Asylumeasyliving (A In Reply to: RE: KT66 vs KT77 posted by Chris O on September 11, 2008 at 08:26:57: Nov 15, 2019 · Quel pourrait être l'apport des KT77 dans ce cas ? j'ai vu que tu disais que la KT77 EH est également un très bon tube ! J'ai par ailleurs testé également les 7581 Tung Sol, toujours sur le MC-13S (bias réglé à 60mA), je trouve qu'il sont un peu plus pêchus que la KT66 avec une belle restitution également dans le médium et l'aigu Feb 18, 2011 · The ST-35 can only use EL84 (or their Russian equivalent) output tubes while modern ST-70's built from kits can use EL34, 6L6, KT66, KT77, KT88 or 6550 output tubes. That tube is known for its smoothness and maximum power. EL34, 6CA7, and KT77 are not the same when you hear them. The 1987X is played through a 1971 Marshall 4x12 model 1960A with Nov 1, 2020 · Oldchen Chi-Fi EL34-B amp, auto bias, running in ultralinear mode. All that’s required is to flick a switch on the right-hand side to choose between the basic EL and KT families and the amp does the rest. How EL34 Sounds The Dec 22, 2021 · Similar threads New, reissue GL KT77 vs Tung-Sol EL34 MX117. May 24, 2020 · Has anyone compared the new production Gold Lion KT-66 tubes to KT-77 in the VTA ST70? What differences did you hear? My system is a VTA ST70, SP12 preamp and Klipsch Forte 1's. The EL34 are Telefunkens and the KT66 are TAD. Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Jul 2, 2015 · Whether you’re shopping for a new amp or trying to coax different tones from one you’ve got, this comprehensive look at power tubes and their sonic traits is essential reading. KT66 vs KT77 - Chris O - Tubes AsylumChris O In Reply to: Gold Lion KT66 vs Gold Lion KT77 posted by easyliving on September 10, 2008 at 12:38:07: Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums You should be able to replace that KT77 with a 6V6 with a simple change of the cathode resistor to bias it properly. Mar 20, 2020 · What I'm really looking for is a side by side comparison of these two amps with the following limitations. Plus any fairly close octal equivalents like KT66, KT77, KT120, KT150 etc. Have to put ear right in front of the speaker to hear it, and it's not noticable when music is Tube Tone Talk - guitar amp tubes - EL34 KT77 KT66, 6L6, Genalex, Mullard, vintage vs. Looking at the spec sheets, they both have max dissipation of 25 watts I am assuming that this means the KT77's bias at the same levels (the recommended setting for the EL34's, is anywhere from 360 - 440 mv for the Jolida 3502 Mar 6, 2010 · If anyone has used a quad of the KT77's by Gold Lion I would certainly be interested in their opinion of that tube vs. (View our complete selection of KT66 vacuum tubes) KT66 Tubes: Gold Lion KT66 reissue JJ Electronic KT66 Shuguang KT66 Saratov KT66 Apr 7, 2023 · KT66s in place of KT88 tubes I expect there will be a change in bias, and a reduction in power. RE: KT66 vs KT77 - Chris O - Tubes AsylumChris O In Reply to: RE: KT66 vs KT77 posted by easyliving on September 11, 2008 at 04:42:57: Aug 18, 2008 · KT77's go in place of EL34's, not 5881/6L6's. It was originally produced in the UK. Aug 12, 2014 · **Updated video here: • Tube Shootout 2. I'm not really hearing out of the EL34 what others describe, at least I don't think I am. People seem to like them, but if you have one fail don't be surprised. 450 VDC for KT77 output tubes. KT 88? The KT 77 tube will result in a deeper and more open frequency with a clean, high-end. 53K subscribers Subscribed Apr 24, 2019 · The manual says it can take the following: 6L6G, 6L6GC, 7581A, EL34, EL37, 6550, KT66, KT77, KT88, KT90, KT120 I'd say I liked the KT88 over the EL34 as it seemed more "in your face", in a good way. Jan 30, 2020 · With the LM 211iA, the KT77's do sound nicer and are also a replacement to the standard EL34's. I know that even different brands of the same tube can sound different so that's why I mentioned "in general". EL34, 6CA7, and KT77 are all drop-in replacements for each other. Why has this tube escaped me thus far? Why is it not more popular? Many folks don't sell this reissue tube. Thanks! Jun 2, 2021 · KT66 Tung Sol, Tube Amp Doctor, Genalex Gold Lion? (Read 6059 times) May 19, 2021 · I have a Dialogue premium integrated (EVO 300's older brother) and I've tried most of those tubes, GLGGC, 7581A, EL34, 6CA7, KT77, KT88 & KT120. This is a true The stock EL34 Power Tubes of the Marshall 1987X are compared to KT66 Power tubes. Apr 21, 2018 · I've been using Genalex Gold Lion KT77 power tubes in lieu of EL34s in my Line Magnetic 211IA since I got it. Any power tubes that sound different- more "golden", euphonic, etc? Type and brand, new production if possible among KT77, KT88, EL34, etc. Feb 7, 2020 · First > On section 3 of page 11 of the VTA ST-70 manual it mentions that KT77 output tube can be biased a little higher than EL34 output tubes. We continue the research daily, so Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Sep 25, 2015 · This is not a reissue, but a brand new tube. Tube Shootout 2. These tubes, vital components in tube amplifiers, significantly shape the sound of your guitar amp. Learn about the key distinctions between EL34 vs KT66 tubes & gain valuable insights to help you make an informed decision for your amplifier setup Jul 8, 2017 · I like the JJ kt77's in My st70. I asked one of our new AI overlords for the sonic differences between EL34 and KT88 tubes and this is what it said. Jan 23, 2025 · EL34 vs 6L6 vs EL84 vs 6V6 & More — A Player’s Perspective! Author: Santiago Motto | Updated: January 23, 2025 | This post may contain affiliate links. About the same price. You get the same maximum clean power output, but the KT77's higher Gm means it gets there with less drive signal. I've run them all in a Reinhardt Vintage 50. If your amp will accommodate both EL34 and 6L6GC type tubes, you might try the Gold Lion KT77, and – for a warmer sound - the Russian 6P3S-E 6L6GC (which are very reasonably priced). :thumbsup: Jan 13, 2009 · Gold Lion 続きですが、せっかくですからKT66も見てみるとしましょう。 KT77はEL34と互換ですが、KT66は6L6と近似とされています。 これはKT66は6L6よりフィラメント電流が高く、プレート電圧定格も高いなど、どちらかとスーパー6L6と言った性格の真空管だからです。 KT66のオリジナルはイギリスのMOV Nov 9, 2019 · I have the Gold Lion KT77's in my EL34 amp and like them very much. The Tung-Sol 6550 is going to sound different. Lots of harmonics, decays etc. Learn about their unique characteristics & how they impact your amp Dec 16, 2008 · KT77 are a direct swap for EL34s though they bias slightly hotter. Nov 16, 2017 · Anyone have experience with the Tung Sol 7581a vs. Jan 2, 2017 · The European equivalents to the 6L6 family, the KTs (KT66, KT77, KT88) were electrically interchangeable but had a different internal construction. You can find how to do that over at AX84. The first el34 amps had jtm45 faceplates November of 1965 to mid 1967 jtm 45 used the 784-103 output Jan 5, 2009 · オクタルベースは丈が低めの物ですが、全体の高さとしては普通のEL34と一緒です。 このGold Lion KT77の音質ですが、EL34と差し替えてオーディオアンプで鳴らすと、ビーム管特有の高域の抜けの良さがとても良い感じです。 Nov 7, 2006 · With JJ KT77 however, the ability to "bring back" the more rich mids is less feasible (than it is to use EL34 and get a more clear midrange sound, or get deeper lows). Common Types and their rating There has been many 6L6 variations, but the most common ones today are: 6L6GC - 30W version. Not dry like a KT88/120. For those who have heard both, do you agree? I'm on the hunt for a new amplifier and since much of what we listen to is classic rock, the distinction may be important. No way of knowing which one you would like best. I like the KT120s but just want to experiment with different sounding tubes. The Genalex Gold Lion KT66 is a nice tube in any ST-70 type amp. Sep 4, 2021 · The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Jun 18, 2019 · Got about 200hr on a set in my Rocket 88 and think they are the best sounding of the small power tube genre that I've tried (T-S EL34, GL KT77, etc. Though, there are a couple modern KT66’s that have been said to be like a cross between 6L6/KT66 and KT88/6550. On the other hand, KT66 tubes have a higher overload tolerance, which is why they’re often found in jazz guitar amps. The two are like two samples of the same car with the same top speed, but one (KT77) is modified for faster acceleration. Which vacuum tube is the best- KT 66 vs. but in the process, shoot some before-and-after footage to see Sep 2, 2023 · KT77 vs KT88Circles » Audio/Video Gear and Systems » Tube-o-phile Circle (Moderator: JakeJ) » Topic: KT77 vs KT88 May 18, 2006 · I’m not sure KT66’s would be closer to KT88’s, vs 6L6GC. 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. I've never really listened to the 6L6 tube before do any members have any thoughts on 6L6 tubes vs EL34's? I am running the Genalex KT-77 re-issue tubes in my amp and love how it sounds now. I tied the stock EL 34 and swictched to the Gold LION KT66. Not quite the bass that the KT88's have, but sounding more like an EL34 but with more bass. The plate is also a fair bit longer than the KT77. I really RE: KT66 vs KT77 - Chris O 08:26:57 09/11/08 (1) In Reply to: RE: KT66 vs KT77 posted by easyliving on September 11, 2008 at 04:42:57 If your amp is autobiased (cathode resistor), an EL34 compatible tube will give you the best results. Their main difference is that kt77 tubes have more headroom, detailed highs as well as bigger bottoms than the el34 tubes. The sound is bigger, more robust and dynamic with the KT 66. The Reference Pentode and Beam Tetrode Thread EL34, KT66, KT77, KT88, EL11, EL12, EL3N, EL35, EL37, 6550, 6L6, EL51, EL39, 4654, 4699, KT63, KT61, 6V6, etc Home Forums Equipment Forums Jun 23, 2020 · Bonjour a tous, Je suis l'heureux propriétaire d'un ampli Line Magnetic LM-34IA avec 4 tubes de puissance EL34 (push pull). Most of my amps have EL34's which I like. Also if you look at the screen current it's less than the EL34 by 5mA for the same operating point which would indicate the grids are aligned unlike a EL34 being a true pentode will have non grid alignment. It came with a matched Quad of NOS Amperex Bugle Boy EL34's. 5k to 4k primary) 784-103 output transformer is for the kt66 amps. bfovrgkpkmrtcyihbkcqhejvoqnsxhuzgftjmilxqxjakxkrbuyxrdfosplompuhxyyhncaesufktcarbnkw