Thanks EW. With the correct tubes in, I am getting the sputtering which has the unit on the bench (I'll be doing this with the work of a good friend). I did send a charge through the system that fried some fuses when I plugged a live rca plug in with the two 12ax7 tubes in both positions. It generated a loud noise and two nearly NOS GE 5ar4 went with it. I've inadvertently done this before, but never with this result.
PS: once running, will a 12BH7 be plug and play, or will a resistor value need to be changed?
Thank you, EW!!