DrewB
Tele-Afflicted
I'm trying to find technical info on Marshall's 4-diode rectification circuit. I think I have rectifier issues in my 1987X. No fuses blew, but it went real quiet. I have 347 volts entering the first pair of diodes and 189 volts coming out of them into the second pair. On the "out" side of the second pair, I have zero. I don't have plate voltage on any of the tubes. This is new territory for me. Based on my experience with valve-rectified amps, I would expect to see voltage increase coming out of the rectifiers; I used to have 436 volts on the EL-34s' plates. Am I right in assuming that the voltage should increase, or is there another component that brings that voltage up? I thought I read somewhere that Marshall used a voltage multiplier rectifier circuit, but I haven't been able to find anything on it now that I need it. Any help you guys can provide will be much appreciated!
