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Buzzing when VCR connected to TV

I have a JVC S-VHS VCR hooked up to my Pre amp via audio cables and have the video connected to a Pioneer Elite Plasma. When the VCR is playing and the TV is on I get a pretty aggressive buzzing in the speakers. If i disconnect the video cable from the VCR to TV input , dead silence.
But if I use the coax TV out on VCR to B-Antenna In on TV the buzz is present but not as bad. Any ideas? Filters? Can't seem to get it gone.
theo
theo's avatar
theo OP
2,719 posts
 
The problem is that the buzz is worse when video is connected between VCR and TV via S-Video or Composite.
It lessens somewhat when using coax. I am using this only to play some old concert VHS tapes and since it has an analog tuner I don not have it connected to any antenna at all.
But will try a filter and see if that fixes it.
jea48
4,733 posts
 
Theo,
Question is do you have a CATV cable connected to the TV?
If so disconnect the CATV cable from the TV or CATV cable box and see if the buzz/hum stops. If it does the problem is a ground loop caused by the CATV cable system grounding.

Is the sound your hear truly a buzz or is it a 60Hz hum?

If a ground loop hum problem.
When you connect the VRC to the TV you complete a current path from the CATV coax cable through the VCR to your audio system then on out your safety equipment ground to the electrical panel then on to earth. (A difference of potential, voltage, exists between the CATV coax cable ground and the safety equipment ground of your homes electrical system.)

If disconnecting the CATV coax cable from the TV does not stop the buzz then the problem could be high EMI/RFI emitting from the Plasma TV and entering through the video cable.
theo's avatar
theo OP
2,719 posts
 
I have tried a cable coax filter, disconnecting the DirecTV, lines coming in, and no change. It is abuzz that actually I can hear a chopping noise that occurs as I rampp up volume on the pre/pro. Also if I turn off the VCR it goes away, but that choppingnoise is still there when I ramp up or down the volume. It goes away when I disconnect the TV input whether it be coax, s-vid or composite. But I am starting think that it is the VCR producing a noise. I have an old ProScan that I will hook up and see if any change occurs.
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