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I had bad luck with JJKT77s in that they don't cut the sonic mustard compared to the KT88s (either surprisingly great sounding no longer available Sovteks or newer Gold Lions) currently in my SEP "Fire Bottle" HO. I might try the GL 77s, but...meh…the amp sounds so damn good I kind of lost interest in 77s…go HO!
@wolf_garcia "I had bad luck with JJKT77s in that they don't cut the sonic mustard."
You're right about that. Not sure why, but JJ did a poor job with this tube. Kind of a head scratcher, as their E34L (as Viridian / Marty pointed out) and EL34 sound very good.
I also think the Shuguang EL34B will surprise a lot of people, and sound fairly close to the JJ EL34. And though I'm generally not a fan of most Russian tubes, for a bigger and robust yet easy to listen to sound overall, the ElectroHarmonix Big Bottle 6CA7 make me happy
Joe, here here, the Shuggie is a fantastic tube, and one of the very best values out there. Super call.
I still have a quad of the welded plate EH 6CA7s and while I am not partial to them, I can see how some will go crazy over them. A beam power tube has a different sound quality than a tetrode does, and I think those that like the 6550 will enjoy it’s uptown cousin the 6CA7. The later, crimped plate, EH 6CA7 has a subtly different sound to it.
In my collection I have a big bottle Sovtek 6CA7 quad from the late 70s or early 80s that seems to be repurposed 6L6 variants. Very interesting, but not so good. But we’re not talking vintage here or I would bring up my favorite Teslas.
Some folks like 6L6 variants as a sub for EL34s. The Dyna ST70 manual actually says to use these in a pinch. So 7581/KT66/6L6 would all work.
They are certainly not electrical equivalents of the EL 34 family, and should not be considered direct subs, but some will like the distortion spectra and your power transformer should run a little cooler.