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Antique Sound Labs Mni-phono Noise

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Any tips on reducing noise other than the standard tricks?
Hiss, Humm, Radio Pickup?

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Re: Antique Sound Labs Mni-phono Noise - Audiopro 15:48:04 09/07/03 (3)
I've seen a couple of mini-phono's. The hiss comes from the tubes. If you have one with the EI tubes in it, get rid of them. As for hum and radio pick-up, there could be a ground wire off. They have very little residual hum normaly.
- Re: Antique Sound Labs Mni-phono Noise - P. Murray 16:45:18 09/07/03 (2)
  Not being a tube expert (yet :> ) what would I swap in for less hiss?
  The hum:
  It seems all too happy to pass on 60Hz AC to the DC line at high gain. I tried putting a ground defeat plug in - no difference.
  I have a PS Audio P600 power supply that can generate wave patterns other than 60Hz and all get passed at high gain. Would putting in a dedicated ground for PS Audio help? Probably not.
  What would be the best way to get rid of this completely?
  - Re: Antique Sound Labs Mni-phono Noise - Audiopro 05:53:29 09/08/03 (0)
    JJ 12AX7's work very well in these preamps. They may also cut some of the hum I've found. Lifting the ground to the AC doesn't work. I suspect a ground wire off internally.
  - Re: Antique Sound Labs Mni-phono Noise - Joe Lau 05:01:14 09/08/03 (0)
    Parallel a 47P at input can reduce RF Interference. New version already add it.

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