Author Topic: possible interference issue?? please advise  (Read 1466 times)

AMP82-01-00

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possible interference issue?? please advise
« on: January 08, 2015, 07:10:49 PM »
On my 60 cherry Concert grand I've recapped it and went through all of the circuits. Its my show piece under my tv on the wall. If its under the tv it has a sound of a untuned AM station just the static part nothing audible.

This is using the tape input and the mpx stereo input as well. The cord I plug my phone in acts like a antenna making it vary it loud static sound.

Here's the kicker if I pull the console 3' from the wall its perfectly quiet.

I haven't tested any tuner tubes. Is there any that are suspect to check? I'm tempted to buy all nos tubes for the tuner.

Before I recapped the tuner and remote unit it had lots of random crackles and pops. Those are gone after the recap.

Finally everything with the remote works perfectly.

Also I live close to a AM radio transmitter it totally messes up my ability to pull in radio stations on FM even in my car too.
David        "If it ain't interesting, its really just boring"

Harbourmaster

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Re: possible interference issue?? please advise
« Reply #1 on: January 08, 2015, 08:18:19 PM »
Let me guess... there is an electrical outlet behind the console when it's against the wall? 


Or there are cables running to/from the TV that is hanging above it??
-- Aloha, Ken

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AMP82-01-00

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Re: possible interference issue?? please advise
« Reply #2 on: January 08, 2015, 08:19:33 PM »
Yes both!
David        "If it ain't interesting, its really just boring"

AMP82-01-00

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Re: possible interference issue?? please advise
« Reply #3 on: January 08, 2015, 08:20:10 PM »
What's going on? I've read about tv power supply's causing issues.
David        "If it ain't interesting, its really just boring"

Harbourmaster

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Re: possible interference issue?? please advise
« Reply #4 on: January 08, 2015, 08:42:27 PM »
Your interference is most likely caused by the AC wiring.


Is your house old?  If it's not fairly modern, using Grounded 3 wire Romex cabling, it may be as simple as that.
-- Aloha, Ken

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AMP82-01-00

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Re: possible interference issue?? please advise
« Reply #5 on: January 08, 2015, 08:54:37 PM »
It was finished January  2011 so it's not too old.

Now I hear very mixed reviews on adding a ground to our consoles. I've never done it myself.
David        "If it ain't interesting, its really just boring"

Harbourmaster

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Re: possible interference issue?? please advise
« Reply #6 on: January 08, 2015, 09:19:10 PM »
Well that pretty much lets the mains wiring off the hook. Looks like you have an issue with the shielding on the TV (or some other nearby AC powered device).


I have read anecdotal evidence that many Plasma TV's can throw off enough EMF that it can cause interference several hundred feet away!
-- Aloha, Ken

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AMP82-01-00

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Re: possible interference issue?? please advise
« Reply #7 on: January 08, 2015, 09:29:59 PM »
I guess for testing purposes I can move a a/c line around behind the tuner to see what makes it better or worse. Then maybe just a reroute of cables will help.

It's frustrating because I like when a set is dead quiet after a rebuild. It is but not under that tv. Those wires are veryou close to the rear of the tuner.


I am running it without the back panel off. I do that to let the unit run cooler.
David        "If it ain't interesting, its really just boring"

Harbourmaster

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Re: possible interference issue?? please advise
« Reply #8 on: January 08, 2015, 09:53:11 PM »
The back panel would not make one bit of difference, you need metal for shielding if it's interference from AC.
-- Aloha, Ken

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AMP82-01-00

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Re: possible interference issue?? please advise
« Reply #9 on: January 08, 2015, 10:08:36 PM »
I'll play around with it and see what can improve it.
David        "If it ain't interesting, its really just boring"