Ty_Bower wrote:I must confess I have not actually checked the bias.
OK, I've checked the bias. B+ is running right around 390 volts.
TP1 = 314 mV
TP2 = 310 mV
TP3 = 356 mV
TP4 = 341 mV
TP1 and TP2 look perfect to me (the right side outputs), considering the B+ is just a bit high. I'd like TP3 and TP4 a little lower. If I leave it where it is now, that one tube at TP4 is barely under 14 watts.
Now to find my plastic tweaker...
edit: I've got TP1 & TP2 both set at ~311 mV. I can't seem to get TP3 any lower than ~341 mV, so I set it there and left TP4 where it was. I guess I either need to swap in a different pair of tubes for that side, or think about changing out the fixed resistors on the board.