I get radio signals through my amp [message #13661] |
Fri, 14 May 2010 21:09 |
XsSpeed
Messages: 9 Registered: September 2009
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Junior Member |
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I just got done with a gig and while I was playing through my 200, I was getting serious radio traffic coming out of my Ampeg SVT 8x10. I've had that before in my basement during practice and blamed the old Mu-Tron Bi-phase or my basement wiring for it but it never happened during a gig. It was really loud too! I turned off the Mu-tron (even though I wasn't even running through it at the time) and unplugged from my effects pedal (overdrive ODB-3) and got no relief.
What is causing this and how do I stop it? thanks.
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Re: I get radio signals through my amp [message #13746 is a reply to message #13661] |
Mon, 24 May 2010 06:12 |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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kustom issued a cure/fix for this problem to dealers in a bulletin back in 69.
The fix is placing a .005 cap in serise with a 47k resistor to to ground off of the tip/hot connection of the input jack.
The cap comes first off of the jack followed by the resistor.
The cap be a cheap ceraimic type, and if it has even just a 50 volt rating thats plenty, the 47k resistor need olny be a 1/4 watter.
Be carefull installing this on amps that have the 5 watt resistor on the pilot lamp, as these gat vert hot and stay hot for a good couple of minutes after the amp has been turned off, and also much sure that the gear is unplugged from the ac power when working on it.
The two big power supply filters bleed down very fast voltage wise once the amp is off so if the gear is unplugged from the wall the shock factor is zero within two minutes.
[Updated on: Mon, 24 May 2010 06:15] Report message to a moderator
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