Use 1N400n series diodes? No, no, a thousand times no! The 1N400n series parts are nasty,
noisy, trash. Use UF400n diodes in place of the corresponding 1N400n parts. The difference in cost is pennies, but the difference in switching noise levels is
HUGE.
I've long since forgotten what I said in the thread mentioned by m2racer.
Take a close look at the 8B schematic. It employs stacked diode pairs in a Greinacher doubler B+ PSU, just like the H/K Cit. 2 does. Contact
Jim McShane and buy the same diodes he puts into a "Deuce". Buy the film snubber too. If replacement PSU caps. have not already been purchased, talk to Jim about increasing the value of the parts in the doubler stack. If you do increase the cap. value in the doubler stack, buy Jim's NTC inrush current limiting thermistor kit. What's going on in an 8B is quite similar to what's going on in a "Deuce". We
are talking about 2 of the very finest "vintage" amps ever offered to the public.