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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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I've finished building the first of my M-60s and, to my amazement, it more or less works (it's my first ever kit). All the tests in the manual check out OK, pin voltages are as they should be, it even plays music. But there's a substantial hum through the speaker. Sounds like 60hz. Can't see anything wrong except maybe the output filter cap voltages. C1 and C2 don't look right. Maybe someone could look at the readings and tell me if they look wrong?
Positive Negative
C1 +16.9 VDC +17.8
C2 +16.9 +17.8
C3 +137.8 -17.8
C4 +138.1 -17.8
I'd be grateful for any suggestions.Thanks,
George
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Topic - one humming M-60 - georgeh 15:10:45 09/18/99 (12)
- Re: one humming M-60 - georgeh 16:26:51 09/18/99 (11)
- Re: one humming M-60 - Dan 18:27:19 09/18/99 (0)
- Re: one humming M-60 - Dan 18:24:44 09/18/99 (9)
- Re: one humming M-60 - georgeh 18:45:28 09/18/99 (8)
- Re: one humming M-60 - CONCERNED M60 OWNER 13:49:36 09/19/99 (1)
- Re: one humming M-60 - georgeh 16:40:34 09/19/99 (0)
- some progress... - georgeh 07:35:05 09/19/99 (5)
- Re: some progress... - John Harper 02:05:39 09/20/99 (4)
- Re: some progress... - georgeh 03:17:58 09/20/99 (3)
- John - your suspicion was correct... - georgeh 15:33:19 09/20/99 (2)
- Buzzzzzzzzzzzz - John Harper 01:37:59 09/21/99 (1)
- Re: London - georgeh 19:22:07 09/21/99 (0)
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