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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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In Reply to: Re: RE: "a very low power supply buzz" posted by William Daley on August 7, 2004 at 10:33:20:
My MA-1s, that I built eight years ago, are completely silent through the speakers. The
transformers themselves make a little mechanical noise.I once had Berning EA2-150 power amps, that had a low-level buzz in the output, probably
similar to yours. I demonstrated the origin of this by simply wiring up a temporary D-cell
battery supply for the filaments of the voltage gain and driver tubes. The buzz went away.A possible cause of your problem is coupling of rectifier noise from the high voltage
windings of the driver supply transformer to the filament winding and then through the
heater-cathode parasitic capacitance of the voltage gain and/or driver tubes.From your post, it sounds like you have the skills to repeat my experiment on your amp.
Good luck!
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Follow Ups
- Driver supply transformer - Al Sekela 11:44:32 08/07/04 (6)
- Re: Driver supply transformer - William Daley 07:48:46 08/08/04 (5)
- DC filament supply - Lew 07:25:45 08/09/04 (0)
- Re: DC filament supply - Gexy 09:47:59 08/30/04 (0)
- Filament supply - Al Sekela 16:51:17 08/08/04 (3)
- Re: Filament supply - William Daley 09:41:14 08/09/04 (2)
- Thanks. Please let us know the results. (nt) - Al Sekela 14:39:56 08/09/04 (0)
- Re: Filament supply - Lew 10:43:17 08/09/04 (0)
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