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Old 17th November 2012, 09:44 AM   #21
rrae is offline rrae  Norway
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Yes Perry, i can confirm. I got -63v and +33v. measurement done by - black probe at negative terminal, red on each rectifier center leg.
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Old 17th November 2012, 02:57 PM   #22
Perry Babin is offline Perry Babin  United States
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Use the negative speaker terminal for the reference point (black probe).
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Old 17th November 2012, 05:20 PM   #23
rrae is offline rrae  Norway
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Then i got +65v and -66v
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Old 17th November 2012, 06:05 PM   #24
Perry Babin is offline Perry Babin  United States
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Check the legs on the rectifiers to see if any are broken.
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Old 20th November 2012, 05:13 PM   #25
rrae is offline rrae  Norway
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They are good, i replaced them, still the same.
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Old 20th November 2012, 06:01 PM   #26
rrae is offline rrae  Norway
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Ok, when i operate "high/low" (!) level switch, my rails at rectifiers are changing. When switch is in position "hi" - my readings at rectifiers are -62v and +33V on center legs. When switch is in "low" position, i get -32 and +33. Amp ground terminal as reference.
When using negative speaker terminal as reference, i get good -62v and +62v on both switch positions.
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Old 20th November 2012, 08:34 PM   #27
Perry Babin is offline Perry Babin  United States
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Is the high/low audio signal input switch?

That shouldn't make a difference since it only appears to change where the amp gets it's turn-on signal.

Use the negative speaker terminal as the reference when measuring the voltages on the secondary side of the power supply (rail, regulated...).

At this point, does the amplifier produce audio?
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