I am not sure about the posts concerning swapping EL34's for KT-88's not working well, I have to guess that with the right bias setting(negative voltage on the control grid relates to the amount of current flow through the tube, usually referred to as cathode(or)plate current).

What I have not been able to determine, is the EL34 current for class A operation. The KT-88's operate with 80ma(read as mV across 10 ohm precision resistor from cathode to ground which equates to direct mA reading), I am not sure if 40mA is best setting for EL34's, but as I told Bill, I guess as long as the plates are not "cherry red" and the sound is okay, I think it is fine.

I believe the manufacturer is Divergent Technology out of Canada, but the units are Chinese built. Anyone with these units can derive immediate improvement by getting rid of the Chinese tubes. They do work, but are forward with midrange glare to me.

I will find a link to the amp here soon, I purchased through a AK forum sponser.

Regards, Ron