6L6 vs EL34

Al thanks as always for your technical knowledge and trenchant comments. The conversion idea hadn't gotten past the musing stage and Vu and I haven't seriously discussed it so we haven't gotten quite that far. These guys design and build great sounding reliable gear, including amps using the 6LG tube so I am assuming they do know of what you speak. But good to have that knowledge for myself thank you!

Im lucky, I can use many different output tubes in my amps....  I've had 5881, 6l6, KT88, KT66....  and I keep going back to EL34.   They all sound good, I guess I just prefer the EL34 tone.     I would like to try some KT77,  just retubed to Mullard repops so maybe down the road.

New Tung Sol 7581A are impressive. Search forum for my comments.

Conversion is
changing 1 resistor in the bias circuit, changing screen grid resistors (if applicable), then bias it w a scope.
But you an change from EL34 ,6L6, KT66, 6550,etc. pretty easily.

EL34 being the European hi fi tube, specifically made for music.
6L6 being a home version of military (5881) amplifier tube.

But KT77 is already pretty sweet. I don't think there's going to be a huge change by swapping to EL34.
6L6: that's better for guitar amplifiers. Not really a hi fi tube, but Telefunken is selling them now for broadcast etc.anyway.