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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Sort of posted by GBLPS on April 6, 2007 at 11:55:34:
Hum is not a problem with DC. Hum is usually either 60Hz or 120Hz. You can't hear DC.I am a power engineer, so I can help with the breaker panel better than I can with the amplifier guts. However, I would say 60Hz hum is entering your signal path either through the heaters or through electromagnetic induction (signal leads too close to transformers, lack of shielding, poor grounding, etc). 120Hz buzz is typically through the power supply (electrolytic caps poor, inadequate filtering).
PP usually has good PSRR, especially with feedback. Now that you've gone SE, I would suspect you need additional filtering. Or else heater leakage through the 2A3.
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Follow Ups
- Okay, that's good information - KurtP 13:35:06 04/06/07 (2)
- Re: Okay, that's good information - GBLPS 15:07:47 04/06/07 (1)
- Re: Okay, that's good information - KurtP 17:54:12 04/07/07 (0)
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