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Restoring a sorry SP-10. Need a picture of the underside of the audio section circuit board. Also need an advice on how to proceed with a blown power supply: can I turn it on without the audio section connected to check the voltages? Or with audio section connected, but with tubes out?
Any help appreciated
Thx
M
Follow Ups:
Thank you Lew
I have replaced all large voltage regulators and zener chain, and all electrolytes as well. I also found the pictures I was looking for. Waiting for some new film caps, and as soon as I put them in, will bring this thing up very slowly on variac. My main concern is whether the IC chips are OK... I'm not sure what I will see on B+ if they are blown: does any voltage goes through at all? So far all the little diodes around the chips seem to be fine. May be I will get lucky :-)
I deleted the pic and links.
wtf..
I wonder what I did to make this guy so annoyed with my post?
Whatever it was, I hope it was really really annoying.
Edits: 03/17/16 03/18/16 03/18/16 03/19/16
I needed some technical information on restoring the SP-10, because this one had a lot of stupid mods and rewiring done on the underside of the board. I know the link you posted, does it have a picture of the underside? No. I know all about the Mk Ii version, not interested thank you. I also have read your posts on how much money you made on the SP-10, and how the SP-15 is oh so much better. Not interested either. Please, if you can not answer my questions please refrain from commenting. Thank you.
You could do either, but you wouldn't get a true value for voltages that way. Furthermore, if you really do know that it is "blown" you risk damaging the power transformer by turning it on at all. How do you know it's blown? Before you do anything, it might be wisest to replace all the electrolytics with new ones of like value and voltage rating, given that you say it is in a "sorry" and probably neglected state. Also, it would not be crazy to replace rectifiers empirically. At that point, you might consider ramping up the AC voltage slowly with a variac, looking for "smoke" as you do so and/or monitoring DC voltages.
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