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RE: PAS-3 hum (I know, I know)

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In Reply to: RE: PAS-3 hum (I know, I know) posted by CaseyTheLibrarian on January 17, 2017 at 08:34:08

Casey mentioned his tech thought it was in the right channel only. He also mentioned the hum went away when the power cord was pulled from the wall. Does the any of the units have a three prong plug? If so use a ground lift plug and see if the hum is gone. If it is a standard two prong plug try running a wire from the center of any three prong outlet to chassis ground.

The other thing to take into consideration is the fact that both of these units are not stock and could have not been right from the mods performed.

Follow Ups:

RE: PAS-3 hum (I know, I know) - CaseyTheLibrarian 16:56:54 01/23/17 (2)
No 3-prong plugs here.

I forgot to update this. I took Peter's suggestion and also an old one from Bill Thomas and emailed my tech who wanted to try them out.

Happy to report that the hum is gone, as far as I can tell. He rerouted the ground wires to 1 instead of 8 (I think I am remembering that correctly).

Now I need to maybe reinstall the tone controls :/
- RE: PAS-3 hum (I know, I know) - xaudiomanx 17:17:14 01/23/17 (0)
  Casey,
  
  It is to my very little knowledge that when you pull a power cord from the wall before the unit powers down totally and it kills the hum, it is generally a ground loop or some kind of grounding issue.
- RE: PAS-3 hum (I know, I know) - xaudiomanx 17:15:15 01/23/17 (0)
  If the hum is gone and the unit sounds good leave it alone. Just a suggestion. Tone controls aren't necessary but I did like them on any of the vintage equipment. I am a believer of them is a big way. You can do a lot with them for music appreciation but mainly with vinyl. CD's and the anything digital is probably as good as you can get it without the use of tone controls and tone controls when using digital can promote issues sonically.

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