Iv'e gone through 2 1N4751A diodes (D9) on the 1650-rd schematic). The amp will play and sound great for about 3 hours and then nothing. Is there a better replacement for this or should I look for a problem somewhere else?
Fri, 10/23/2015 - 18:18
#1
MidCenturyAudio
Look somewhere else
I'd say - considering the 1N4751A has lasted over 30 years (as opposed to 3 hours) in so many amps, look for the problem elsewhere. Check the components surrounding the zener. Does zener survive with no tubes in the amp?
Cheers,
Lars Verholt