Hello Helpful Online Peeps,

I have an Ultimate Chorus that I've been gigging with for a couple of years without any problems (other than some smoldering that had to be done on the board a couple of years back) but came across an issue at a show that I can't really figure out. My amp was miked and about halfway through the show, it started to feedback. The normal adjustments in volume didn't work, and I had to shut the amp off completely before it stopped. The only way to get it to play without the sound was to turn my treble down almost completely. I was able to get through the rest of the set but I'm a bit worried about our upcoming show having the same issue. I've played with a number of time at practices since, without any problems.

Any thoughts? I would be eternally grateful.

Baron

Do you mean the older version of the Ultimate Chorus from the early 90's? Mine was (and continues to be) bullet-proof, did you try a different guitar with the amp to see if it's a problem with the guitar?

I'm also wondering if the feedback would have been there if you shut the mic off (problem with the PA?). I just know these amps to be very reliable, thinking your problem might be coming from another source...

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Strings,

thanks for the response! It's the older version and I don't think it's an issue with the guitar (I was using a new Gibson SG and I've also played with it on other amps without issue). I'm hoping that it was a problem with the PA but I'm not certain. Either way, I don't understand why turning down my treble (and my reverb seemed to help).

Baron

I own this amp (mid 90's version) and I have to agree with strings. Not sure why it would feedback. I was going to suggest a mic too. I gigged with mine a handful and never had any trouble with it.

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Before you adjusted the treble and reverb, was it squealing even if you turned the volume on the guitar all the way off?

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Yeah, the feedback was happening if I turned down the guitar and even if I turned down the master volume on the amp.