7581a vs kt66. Feb 14, 2020 #10 Thanks all.

7581a vs kt66 Nearly 80 years later it remains the most used power output tube. GE had a short bottle variation named 7581A/KT66. It The GE data sheet says the 7581A is interchangeable with the 6L6GC. I have 2 new in the box premium general electric 7581a/kt66 tubes. These are different. THD+N Portus. KT66, 6L6GC, 7581A tetrodes and similar KT77, 6CA7 Tetrode, EL34 Pentode similar . Tim Smith rated this tube highly in his 6L6 shootout. TOTALMENTE NUEVOS TUBOS de Aspiradora Tung-Sol Reedición 7581A KT66 Corriente Coincidiendo con Cuatro (4) - EUR 187,12. This bottle has a plate very similar to the 7591 but is enhanced with large cooling fins, a larger 6L6 size bottle and thick mica’s top and bottom. These Tung-Sols were built to last with a very large plate structure and many heat dissipaters for maximum reliability. These tubes have a very warm tone and give you much more headroom if ran in place of a standard 6L6GC. Super, Merci pour le lien Tony ! PS : j'ai vu ton post sur Toby Lee : impressionnant !!!! A+ Claude. I have used JJ KT77, TungSol KT66, TungSol 7581A, JJ and EH 6CA7, and Gold Lion KT66. Brand New Tung-Sol Reissue 7581A KT66 Current Matched Quad (4) Vacuum Tubes The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. Reactions: Bill Ferris, Lavane and Musicman524. These Tung-Sols were built to last with a Anyone have experience with the Tung Sol 7581a vs. The 7581A is a 6L6GC based tube, but supposedly hotter and designed for audio applications. À VENDRE! The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 122912628378 Anyone have experience with the Tung Sol 7581a vs. The 7581A does not use the familiar plate stamping that you see in the Tungsol 6L6GC, 7581 and Kt66. truebluephil wrote: which make a difference. But I've also got some real beasts too: the 272 & 296! They use EL34's & 7581A's! Here's one of a 296. The 7581A tube can be used in any 6L6 based tube circuit. I’ve not heard it, but it could be a possibility in the Elekit. Page 1 sur 1. But the big winner here is the TungSol 7581A. I'm coming from GL KT-66. 7581a: wonderful tonal richness with a very even presentation top to bottom, especially in triode mode. The 6L6 tube equivalent part numbers 5881 and 7581A vacuum tubes are acceptable substitutes in some amplifiers. The 6L6 vacuum tube was first released by RCA in 1936. ) 7581A . 25" High from base bottom to top of Glass envelope, 1. It's not really "that" close to an EL34, but according to Prima Luna's manual the EL34 setting is your best choice available and should work fine though it will somewhat reduce the It may be of interest to note that when the Quad Service Dept. The 7581A maxes at 35 watts. They are getting there slowly. I've tried 7581A and the original variant, think it's the 237 STR Sylvania, in several amps. 99. Passinwind I know nothing. The KT66 plates are bigger than the Tungsol 6L6GC-STR's. New tubes provide To me, and this is me and my gear, the TungSol KT66 is better all around than the GL KT66 as the TungSol sounds a little less "congested" as the GL tube can to me. Kind of surprising since the KT66 has great bass. Top. I heard some details which I hadn't heard before, yet it was in the lower mids /upper low frequencies. The List Price is the suggested retail price of a new product as provided by a manufacturer, supplier, or seller. The 6L6 tube is renowned for its robust headroom and clarity. Kind of remind me of good solid state sound. Joined Jun 27, 2005 Posts 4,124 Location Montclair, NJ. The 7581a is the US answer to the KT66. David Root Posts: 3540 Joined: Fri Aug 04, 2006 3:00 pm Location: Chilliwack BC. It dominates the electric guitar tube amp world. Search this page . The Tungsol is very similar in construction to the RCA Gold Lion KT66 Hi, cant speak for the kt77's, but I just put a pair of the Russian Gold Lion KT66's in place of 6L6GC's in my little Vuum set amp, and WOW what a nice improvement. They are the best sounding tube I have tried and I have done a lot of tube rolling, My second favorite tube in my Dennis Had Inspire HotRod amp Tung-Sol 7581A (new production) ~$40 CDN each. These Tung-Sols were built to last with a very large plate structure and many heat dissipaters for Honestly I remember the days when the black-plate RCA was common as dirt. Built for National and included in the series with the narrowest selection, the Gold, they bear both the code 7581A and KT66 on the packaging I broke down and added another power tube (Tung Sol 7581a) to my collection. Fellow WoS contributor Tim Smith rated the Tung-Sol reissue (Russian) 7581A highly in his 6L6 survey though this was in a hi-fi amp. I would guess about -44V bias would put the KT66 at 70% Pa, at 400V plate. Lampizator TRP, VPI Prime Signature --> Supratek Grange Signature LCR ---> 1101 Audio V6 Thunder, 1101 Audio The world's largest high-end audio community. Bluebook The right price. GL KT66, I was impressed. Subscriber. I have a quad of Telefunken EL34s VERY special. As much as I love my TungSol KT66 (huge soundstage Tung-Sol 7581A (6L6GC variant) Tung-Sol 6L6G (6L6GC in a big bottle) Gold Lion KT88; Tung-Sol KT150; Gold Lion KT66; Sylvania 5881 IME, 6CA7/EL34 can deliver excellent overall sound. Unlike their standard 7581 vacuum tubes, the “A” version is rated for more power. That would explain the 30W vs 35W difference in the reseller descriptions. Anyone have experience with the Tung Sol 7581a vs. 33Wavg/pair. 100% Guaranteed & Tested TubesBrand New Tung-Sol Reissue 7581A KT66 Current Matched Pair Vacuum Tubes The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. The new prod 6L6 big bottle from TS is a fantastic tube. Brice AK Subscriber. It is confusing. Le Forum Bleu :: Publications :: Audio Tubes. The bottle is just big enough to hold the plate structure, so you get a lot of power from a The 5881 along with the 7581A were, back in the day, up-rated versions of the various 6L6 family of tubes. It will make the same power with the same transformer. Very promising but the emphasis is completely different than the KT66. That can get expensive as my Primaluna Dialogue HP Premium integrated has Audiogon The world's largest high-end audio community. Both max at 30watts. Very smooth sounding tube and I prefered them over the GE's, but to my ears they were The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. EL34, KT66, KT88, 6L6 The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. -----Blonde Tremolux with GE 6L6GC/7581A tan based. ¡EN VENTA! The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 122912628070. These were built to last with a very large plate structure and many heat dissipaters for maximum reliability. Paid Member. But, it is not always suitable because of bias voltage,plate voltage ranges, and dissipation 22Wavg vs. Sylvania made a very nice 7581A about 4 decades ago, now fairly rare and expensive. EL34, KT66, KT88, 6L6 Anyone have experience with the Tung Sol 7581a vs. Re: Tube comparison chart. Most neutral of all the tube types and very even top to bottom. Limited quanity available so get them while you can cause when they are gone they are gone!!!!! Anyone have experience with the Tung Sol 7581a vs. Post by David Root » Fri Sep 03, 2010 3:51 pm. That's because the KT66 TS is a 6L6GC in a big bottle. Moderator. Find many great new & used options and get the best deals for 7581A KT66 GE Power Tubes 6 Total at the best online prices at eBay! Free shipping for many products! The new Tung-Sol 7581A vacuum tube is the answer. This tube is a direct substitute for the KT66, and is in fact a version of the KT66. Apr 24, 2016 #18 The only 7591 unit I have is a 233. They lack some of the tonal richness and saturation that the 7581a’s and the KT77’s have. As much as I love my TungSol KT66 (huge soundstage I broke down and added another power tube (Tung Sol 7581a) to my collection. They hold their own against my vintage quads of RCA, GE and SED Winged C. Made 7581A is a fantastic The versions that spring to mind are 6L6GC, 6L6G, 6L6GC-STR, and now 7581a. Last edited: Apr 24, 2016. 35 watt plate and 6L6GC characteristics. In a couple BF Fenders, probably the best tubes I've heard. Logga in. 5" diameter 7581A Tung-Sol (upgrades 6L6GC) King of clean-headroom tone! max. Dec 10, 2023 #10 Lavane said: It can get confusing sometimes with tubes having say EL34/6CA7, or EL84/6BQ5 stamped on them. Strange though, the 7581A looks IDENTICAL to the same vintage GE 6L6GC truebluephil wrote: about 5 watts more power. Thus the claims that it is a big bottle 6L6GC and the same as their 7581A. That can get expensive as my Primaluna Dialogue HP Premium integrated has 8 power tubes. If the PT does not get noticeably or remarkably hotter, then it can handle the current draw. Of course those take more filament current than the 6L6GC. 95 $219. My Carys sure like them. Reactions: gmm52. It has been a staple in American-made amplifiers and is especially favored for genres like blues and rock, where a New Plate Current Matched Pair of Tung-Sol 7581A (KT66) Vacuum Tubes. But now I am wondering whether the coke bottle 6L6G or 7581a might be even better. But the 7581 has cleaner bass. The 7581 and 7581A are NOT the same, as far as allowable rating are concerned- and there's a reason that GE seemed to QUICKLY replace the 7581 with the 7581A! The 7581 may well have been the same plate-set as the 6L6GC- but the 7581A seemed to (from physical comparison) have the same plates as the 7027A. Some Chinese tubes can be a crap shoot as to what they really Anyone have experience with the Tung Sol 7581a vs. This tube is an upgraded 6L6GC tube but willprovide more headroom than typical 6L6GC tubes. Brand New Tung-Sol Reissue 7581A KT66 Current Matched Pair (2) Vacuum Tubes The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. KT66 - Placing a temp probe on top of the PT shows a temp of 105 after 2 hours of play I think its good-to-go I found I do have to adjust the hum balance pot differently for the two sets of tubes . And a second mortgage. kevinkr. Joined Sep 23, 2016 Posts 599 Location Southern Ontario. Hen, set the amp up with the KT66’s biased properly, run the amp and take note of the PT temp. They sound great in my MC30's as well. These tubes, vital components in tube amplifiers, significantly shape the sound of your guitar amp. Buy Brand New Tung-Sol Reissue 7581A KT66 Current Matched Pair (2) Vacuum Tubes: Tubes - Amazon. I've run new 7027A, 6L6GC, and 7581A and feel that although the 7581A seems to sound slightly better, the NOS RCA 6L6GC make a big 7581A General Electric Beam Pentode AF Power-Amplifier (NOS/NIB) NSN #: 5960-00-728-1434; Can replace KT66; Size: 3. This tube is directly substitutable with the KT66, in fact a 7581A IS a KT66. 7581A vs KT66. 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. 1100:-Kategori: Rör Skåne/Kristianstad: Visa på karta. SaturationPt Big Woofer Club. Then when you’ve done with that book get his KT66/6550 book. Even the GE 7581A/KT66 labeled tubes are NOT suitable long term because of this impedance mis-match. Nov 18, 2017 #5 ; gmm52 Tele-Holic. A. JJ chose not to follow other KT66 makers by ignoring any physical resemblance to the original British tubes. 3A. Merch Rep the community and hobby you love so much. The construction reminds me of a GE 6550, including the metal base ring. - Below are the JJ 6L6GC, JJ 7027A, Tung Sol reissue 7581A, and NOS GE 7581A/KT66. plate dissipation: 35W made in Russia The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. A quad of these will draw quite a bit of extra current. If I could combine the bass of the KT77 with the midrange and top end of the 7581a, it would be the perfect tube. They did. Medlem sedan: 2024-04-10. Also included are data sheets for the JJ7027A and the New Sensor Tung Sol 7581A. Cagliostro Ven 17 Mai 2019 - 12:02. I just don't have enough of them to go around! That does not mean that a KT66 is a direct sub for 6L6GC. The 7581A is capable of more power than a KT66. I didn't like them much at all back then, preferring other members of the "6L6 family" - like the WE 350B or the KT66. Inlagd: 2025-03-08 21:01. mad dog Friend of Leo's. The 7581A is an uprated 6L6GC with higher plate voltage capability. A vintage 7581A should be closest to a 6L6GC, and then to KT66. If you can run them Golden Lyon KT66, is a pretty good valve. The parameters are designed to be perfectly interchangeable, in practice it is a 6L6 brought to the highest possible levels . But the I have a pair of the Tung-Sol 7581a tubes in my Dennis Had Inspire HotRod amp. Tung-Sol 7581A / 6L6GC / KT66 / KT77. 9A heater current. The price, though 50% more than the E-H EL34, isn’t We just got our first batch of the new Tungsol 7581A tubes. They could be a tad forward vs the 6L6 on modern pop and rock, but overall they gave the 0/96 a dynamic feel. They are made to New Plate Current Tested Tung-Sol 7581A (KT66) Vacuum Tube. kta-hifi. maxitonus Ven 17 Mai 2019 - 13:17. ) I prefer the “warm” sound of the 6L6 family. I recently bought a quad of T-S 6L6GC-STR on the recommendation of Jim McShane, and I am really impressed with them. The GL KT66 is very dynamic as well, but more 'composed'. To me, and this is me and my gear, the TungSol KT66 is better all around than the GL KT66 as the TungSol sounds a little less "congested" as the GL tube can to me. Often they say 6L6 when they mean 6L6GC. It actually has a higher plate dissipation rating, 35 watts vs 30 for the 6L6GC. . And The 7581 is mil spec of the 6L6GC. 99 with 5 percent savings -5% $ 209. The Tung-Sol 7581A is rated at a higher 35 watts compared to the standard 7581 or 6L6GC. Much deeper low bass and more detail. 95. IMHO-if your amps can run either run Tung Sol 7581A, or Gold Lion KT66-these are most likely going to sound better than other tubes in this lineage, new production or NOS. Brand: Tung-Sol. $209. The new Tung-sol KT66 draws 0. The only suitable substitute is the 6V6 which also has a output Z of 8Kohms in PP Class AB1 configurations. YMMV - Hiya,, For my Mac MC30 mono tube amp, w/o taking out a 2nd mortgage, what's the best all around winner?? Amp originally called for 1614 versions. I have run NOS GE 7581A/KT66's in my MC240's and MC30's Truly great sounding tubes that can be used in place of 6L6GC's. We have various brands like Sylvania, GE and RCA in stock - all new and in original boxes. exhausted their stocks of original GEC / MOV KT66 valves in the early 1990s , their approved high quality replacement for the Quad 2 was either the GE or Philips (U. Joined 2004. jeff Just be forewarned the 7581A is a very dynamic tube-it's not bright, or harsh, but dynamic, top to bottom. New Plate Current Matched Quad of Tung-Sol 7581A (KT66) Vacuum Tubes. I'm presently eyeing a set of 7581's for around $100 Many thnx 🕉🎵🎵 The Tung-Sol 7581A is rated at 35 watts vs the standard 7581 or 6L6GC. EL34, KT66, KT88, 6L6 I broke down and added another power tube (Tung Sol 7581a) to my collection. Sounds very good too. The U. 95 List Price: $219. The 7581-A power tube has a plate dissipation rating of 35W, as opposed to the 6L6GC and 7581 rating of 30W. The KT77 was great on the Devore 0/96 with wonderful bass slam and control, neutral midrange, and clear but not soft top end. Pro with 5881/6L6WGB. These tubes are the highervoltage handling premium 6l6gc tubes. The Gold Lion KT66 draws 1. I have two sets of Mcintosh RCAs 6L6s very VERY special. net. Supertrevliga rör som jag kört i mina QUAD II en kortare period. Unless you have a good set of RCAs Most are gone. Bonjour, Serait -il judicieux de remplacer les EL34 ( Philips) de mes amplificateurs par des KT66 ( JJ ou Shuguang) pour éventuellement améliorer la musicalité » KT77 vs KT66 vs 6CA7 vs EL34 » Tung Sol 7581A » Shuguang KT66 » kt 66 mesures. Every time. Both I have used JJ KT77, TungSol KT66, TungSol 7581A, JJ and EH 6CA7, and Gold Lion KT66. Also, as a kind of addendum, Tung-Sol also reissued the 7581A, the highest rated of the 6L6 family, which can put out 35 Watts, so if someone wanted maximum clean headroom, now they can get it, even on a 120 watt amplifier. Säljes av: Jesper E. (I run 6CA7/EL34 in Scott 272, Pilot SA-260, Fisher X-1000, and until recently I had a Scott 210F. Cagliostro Membre Bleu Messages: 220 Date d'inscription: 17/05/2019 Age: 68 Localisation: Isère . Jun 14, 2008 #5 ; M. I believe that the Sylvania STR-415 and GE 6L6GC(made in Owensboro,KY plant)were built to near 7581A standards. Dec 3, JJ KT66 - The JJ KT66 vacuum tube has got to be the most rugged tube I’ve seen in years. My Daughter Build Stone Henge. S. These Tung-Sols were built to last with a very large plate structure and many heat dissipaters for reliability. This tube is also known as a KT66. List Price: $219. The 1950's Genalex KT66 is the finest sounding output tube I've ran in my MC30's and I find them worth the expense. Just be forewarned the 7581A is a very dynamic tube-it's not bright, or harsh, but dynamic, top to bottom. Not mine but it does appear to have KT66's stuffed in it. Re: Tung Sol 7581A. -Chris . These tubes are new and never used from years ago and here is your chance to get a pair of very high end tubes for your amp. Matched pairs, quads, and octets are availableMore Details Anyone have experience with the Tung Sol 7581a vs. This is actually a good thing in many respects. 2017-11-13 11:25 pm #5 2017-11-13 11:25 pm #5 Of the 6L6 family of tubes the 7581A and MO KT66 were my favorites. These Tung-Sols were built to last with a very large plate structure and many heat dissipaters for KT66 - 6L6GC - 5881 - 7027 (with mod) - 7581A/KT66 KT77 - 6CA7 - EL34 KT88 - 6550A EL34 - 6CA7 - 7D11 - 12E13 - KT77 - KT88 6L6 - 5881. I’m getting an MP-301 MK3 and am looking to upgrade the tubes. Ger uteffekt på 35W och fungerar bra som ersättare till KT66 / KT7. I’ve decided to try the Tung-Sol 7581A (as per your recommendation) as my all around, everyday power tube, but I would also like a second power tube that I can roll for when I am looking to get the most rich, liquid mid-range sound for voices and acoustic instruments. So they should be go to go in any 6L6GC/7581A circuit. The 222C & 299 (no suffix) I have use EL84's or 7189's. If you like the KT66, check out the 7581A. Feb 14, 2020 #10 Thanks all. When comparing the 6L6 vs KT66 vacuum tubes, you’re diving into the heart of guitar amplifier tone. The ones I had and tested read 1800 & 1650 umhos where minimum is 4080 & new (RCA Manual) is 6000 umhos - so very bad, compared to new Russian TS 7581 same age but unused (TS revised the 7581 to 7581A which measures a lot better don't buy the 7581) they read 3400 & 2200 as a so called matched pair from Tube Depot (7 yrs ago - unused) - I tested Most neutral of all the tube types and very even top to bottom. com FREE DELIVERY possible on eligible purchases What do you think of the 7581A vs a typical 6L6? As much as I'm impressed with the Sophia EL34 their voicing is not a good match for my speakers. Virtual Systems Let the world see what you've built. In a couple other amps, tweed pro type TUBE À VIDE flambant neuf Tung-Sol réédition 7581A KT66 courant testé - EUR 69,14. re-issue Tung Sol 7581, reminds me of the old RCA BP. Whether this difference exists today or is just marketing hype is a good question. If you want great sounding US tubes try the GE 6L6GC's. I also liked the beige based, industrial 7581A's. I haven't listened to Brand New Tung-Sol Reissue 7581A KT66 Current Matched Quad (4) Vacuum Tubes . Except for books So there's a big enough difference in both current draw and transconductance to confirm the oft-heard claim that a true KT66 is like a 6L6GC on steroids. These both can handle a lot of plate voltage. lsypqwy clxk ogli eliju kyarkows scqffh arwznkj urean ymzd zjvlyrsr mgk xvrxe axvwhk nxbx ziflfnd