Gold Lion KT77s are a real winner IMO and won’t break the bank. Very balanced from top to bottom with good slam and detail; I haven’t found better as an EL34 type replacement.
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I've been enjoying the 6550's that Upscale recently sent my way. Midrange isn't quite as beautiful as my EL34 tubes delivered but the 6550 midrange is still beautiful as hell and the 6550's give me more top, bottom and punch. (I can't remember the brand name and I ain't gonna pull one of the tubes out its socket to see if it has a maker's mark.)
Another GL KT-77 fan here. They're not cheap, $49.99 each, but they're a huge upgrade over EL34 and Upscale does a good job testing them.
If you're not willing to tube roll some 6SN7's, then you'll never know how good your amp can sound. You should at least roll the preamp tubes; they make a significant contribution to the sound signature.
Is the kt77 a direct drop in replacement for el34 on an amp w/ auto bias circuitry? May have to call Upscale when I'm ready.
Lowrider, I've been down the road of tube rolling with past systems, but don't care much about it anymore at 67 as my ears age. I just want good value and good sound without fuss.