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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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I've been working on a MM phono stage and have been struggling with a bad hum problem. Last night when I was poking around with a oscilloscope I realized that the probe itself is picking up ~2mVpp signal at 60Hz by just holding it in the air. If I touch the tip of the probe with my finger the signal goes up to ~2Vpp. And I get the same 2V signal if I touch the probe to the carpet I'm standing on. I'm starting to think that this is causing my hum problem. My house is 80 years old so maybe I need to check out the wiring. Has anyone ever seen this before?Thanks,
Dan
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Topic - MM phono stage hum - DanK tubes 09:20:00 02/28/07 (10)
- Re: MM phono stage hum - Triode_Kingdom 11:41:41 03/01/07 (0)
- You have to use DC filaments.... - grhughes 06:10:44 03/01/07 (0)
- Re: MM phono stage hum - DanK tubes 13:52:53 02/28/07 (1)
- Re: MM phono stage hum - 33dot5rpm 15:02:37 02/28/07 (0)
- Re: MM phono stage hum - SteveBrown 12:08:27 02/28/07 (0)
- Perfectly normal IME - clifff 10:39:34 02/28/07 (1)
- I agree... - BBeck 11:55:34 02/28/07 (0)
- Do you have flourescent lighting?? - grhughes 10:16:25 02/28/07 (1)
- Dimmer switches are another offender (nt) - JJ Triode 10:53:05 02/28/07 (0)
- Re: MM phono stage hum - Chris O 10:07:00 02/28/07 (0)
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