LOng-time lurker, etc
I just finished my GSG using an Edcor power transformer and Transcendar outputs, fired it up and the one channel that makes sounds, sounds great - of course, you can see where I'm going with this, the other channel has no out, the 6b4g doesn't even light up ... so, naturally, I ask for your help, Forum.
Hoping I can get some general direction as to where to look, but here are a few observations/measurements:
--switching out put tubes, and putting in another 6ax5gt does nothing to change the situation, and both swaps make no difference in the measurements or symptoms - both the outputs always light up and make sound in the good side, and neither ever does in the bad side
-- the most glaring "wrong thing" is that the bias measures ~3.5VAC on either side when connected, but 6.3VAC when disconnected (i.e., measuring between the windings directly); on the bad side of the amp, there is less than 1VDC present with the windings connected top the terminals, on the other, there's 54VDC, and the good side does sound very good, to be sure
-- other measurements seem off, esp around the 6sl7
-- I've completely eliminated the switch, inrush limiter, etc., and have the primaries connected directly to a 2-wire AC input (using the switch on the power strip for on-off)
I used a supposedly-NOS 6sl7 and 6ax5, and I've already got replacements on the way
I've looked over the board to make sure there's no stray bit of wire, etc., but this is a totally new build, very clean, and I'm stumped (I actually had a eye- and wallet-opening dumbass moment this past summer when I rebuilt a fisher 400 and couldn't find a stray wire under a transformer mounting bolt, so I've been extra careful in checking for mismounts, stray wires, etc., though I'm certainly open to the chance that lightning has indeed struck again)
Yay, Happy New Year!
Thanks,
Todd