help troubleshooting an amp picking up radio signal

[kjw215]

You can test ground all the way through the amp easily, without taking it apart, with a meter.
1)Plug instrument cable into amp.
2)Insert power cable into amp, but do not plug into the wall.
3)Test continuity between instrument cable sleeve and power plug ground lug(3rd lug).

Thanks. Fortunately (or unfortunately), the connection through the amp is grounded properly.

I would recommend a series of quick tests:

1) Power-up and monitor your AMP "without" an input connected (no cord, no Bass). If you are NOT receiving the FM station... gradually rotate your AMP through a full 360-deg. Taking about 1/8th turn every minute or so, until complete. If the AMP remains quiet, you have eliminated the AMP as the receiver. Naturally... ramp the gain to at least 1:4 during the test to raise the AMP above the noise floor.

2) If you're looking at #2 that's a good thing... because that means you're looking outside the AMP. And... this should be cut & dry.

Please let me know what you've found...

Test #1 didn't yield anything other than minimal noise, so combined with above, I'm confident that the amp isn't a problem.

I've come to the conclusion that it's my location, and that I might solve this problem with either adding bypass capacitors (probably the best solution, but harder) or else trying out some better shielded cables of shorter length. It may be that I just put up with it for six months.

Thanks for all the help guys.

 

[Steve_64068]

Well... glad to hear the test cleared the AMP itself. We can "fab" a low-pass filter you can plug-inline with your cable. And we'll do this at no charge... if you'll just give me a week. Please drop a private message with your shipping information and we'll get to it soon.