On 2/16/2011 10:19 PM, Wild_Bill wrote:

I'd like to just use 2 tubes (~ 50W) for the power section, but don't
know if the power circuit would need to be modified for only using 2 of
the tubes.

Basically.... you'll be running 3X the plate load resistance.
So, you'll have to change the plate transformer. You could look
for one with 5K load, or.... if you have a 16 ohm output on the
current transformer, you might try loading THAT with the 8 Ohm
speaker.

WOn't be quite right, but it should work well enough.
At least for testing.

Might also want to go trhough and make sure the idling currents
on the two tube are correct and that the B+ hasn't risen past
their maxim ratings.

Jeff