KT instead EL

[trancy]

Hello all

what changes should I make to use KT88 or any other KTxx instead of EL34????

Schematic:

An externally hosted image should be here but it was not working when we last tested it.

thanks

bojan

 

[Gluca]

At a first look I would say

R1, R12+C5, R13, OPT

as you will operate the tubes at different biases/load

Ciao
Gianluca

 

[Sherman]

You probably want a B+ of 400V. Bias at 50mA may work but you might want to go higher. The OPT primary shown is 3.2K. I think that may be a little too low for a KT88, 5K might be a better choice.

Also the KT88 is a tetrode so you won't have the wire from the third grid to the bypass cap (C5). Also you might want C5 to be a higher value.

I'm not sure about the resistor in series with the UL tap. My SE KT88 doesn't have one there.