| High frequency feedback from J pickup
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Hello everyone!
I'm asking for an opinion with a problem I had last night in a studio, I was playing randomly with the eq, tone and pickup controls with the bass and amp (an Ibanez GSR200 with a 400W SWR Head) when I got a very high frequency feedback noise from the amp when rising the volume of the J pickup. Also, the noise was influenced by the tone and eq controls on the bass, and the limiter indicator on the amp was pulsing with a frequency proportional to the loudness of the noise (!!). The problem did not appeared with the other P-style pickup and the wiring of the controls seems ok. Also, i can't reproduce the problem with the 20W combo that i have at home.
Do you think is just the pickup, which always have minor buzzing problems or can it be something else, like a broken pot?
Thank you! | 
