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.
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.