[Dave]

Is there any quick "in a nutshell" explanation why there aren't more pentode
amp designs? I'm guessing it has to do with extreme non-linearity. I am
building a 10W EL84-based ultralinear amp. The triode conversion is a snap
but it drops me down to 5W which is not enough oomph for my 88dB speakers.
Pentode mode would give me 15W which I am inclined to try if it's not too
difficult.

Can anybody point me to a resource where I could figure out the proper
screen voltage required for pentode mode EL84's with an 8K output tranny and
a B+ of 300V? does this voltage have to be regulated, or could I just drop
the B+ with a resistor?

Thx

Dave