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baron55
Active member
CP5150":ulyil0xb said:Just Mike":ulyil0xb said:This has been said a gazillion times before, but if you're going for the VH1 sound, no EL34 will get you there. And on top of that, the preamp of the QR is more like a hot rodded JCM-800. TOo much preamp gain.
So he used EL34s. And I can't get his sound with them? Are you referring to the 6CA7 tubes Ed used? Same tube. US version of EL34 is 6CA7.
Big NOPE on this. Yes the 6CA7/EL34 is commonly referred to as the same tube. But in the US Sylvania Made a tube they they called a 6CA7, but it wasn't even close to a EL34. It was a Kinkless Tetrode like a KT77, and KT88. EL34's are power Pentodes. Sylvania also made these tubes re-branded under the RCA name. EVH used these tubes eclusively and bought hoards of them when they were drying up.
The Sylvania 6CA7 is much closer to an aggressive 6L6 than it is an EL34. Ever wonder why every EVH signature amp uses 6L6's? Because they are the closest thing to his old 6CA7's
Sylvania and RCA made a 6CA7 which was a kinless tetrode but they biased up and had similar plate impedance's of EL34's so they were a easy drop in, but in no way sounded or performed the same.
Only Sylvania and RCA made a real 6CA7. Now supposedly Electro Harmonix makes a clone of this type. But the verdict is out on that one.
Every other tube maker in the world that made a 6CA7 was just a re-labeled EL34.
Cool Article
https://www.tubesforamps.com/el34-6ca7-kt77-differences
EL34, 6CA7 AND KT77
EL34 - EUROPEAN INVENTION
Mullard in England developed EL34 in the 1950's. EL34 handled lots of power in a small envelope. EL34 became very popular in audio amplification. The market expanded. And many European tube manufacturers soon started manufacturing EL34.
6CA7 - AMERICA'S ANSWER
Not to be outdone, Sylvania introduced fat-bottled 6CA7 in US soon after. 6CA7 was not a copy of EL34, it was a design of its own. 6CA7 is drop-in compatible with EL34, but it sounds closer to 6L6 because of this.
GEC KT77 - ULTIMATE EL34
GEC in West London, England introduced KT77 as the ultimate medium power audio tube. KT77 employed an internal construction resembling 6CA7. GEC optimized KT77 for use in audio application. This makes KT77 the ultimate EL34 for audiophile.
THEN THEY WERE THE SAME
As years passed, tube manufacturers consolidated worldwide. EL34 and 6CA7 came to be treated the same because they were interchangeable. This is why you see some NOS tubes marked as EL34/6CA7.
KT77 all but disappeared when GEC stopped production in the 80's.