Hello Stephe, and thanks for your diligent work on this amp. I'm getting ready to perform the mods on my A10, and as you suggest, I want to check the B+ before I start. I will go by the two pictures of the schematic (before and after on the A12), so my question is, what tolerance for the voltages? Also, if you don't mind helping a newbie, at what point (in the schematic) is the voltage to the EL34 increased to bring it closer to operation? Thanks again, Luis