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Post subject: Supersonic effects loop loud buzz
Posted: Thu Apr 10, 2008 2:42 pm
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Hello all,

My Supersonic head has developed a buzz through the effects loop. No matter what is running through it (even when used as a boost) I get the same buzz. It's not a minor buzz, you can really here it and it comes through the PA somewhat. The amp does not buzz if the Effects loop is switched off.

Any ideas what could be wrong here? Is it something minor?

Because of where I am (Australia) getting it to the nearest authorised repairer is a big deal but I can't use it for larger gigs anymore because mic'ing the amp puts this buzz through the PA.


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Posted: Fri Apr 11, 2008 9:25 am
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The pre-amp tubes in positions V4 and V5 are used for the effect loop, The first thing I would try is change them both. If you have to buy new ones, you may want to install lower gain pre amp tubes. Somebody reported having installed a pair of lower gain JJ ECC82s (12AU7's) into V4 and V5, and it made a huge difference according to him in reducing hiss from the effect loop.


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Posted: Fri Apr 11, 2008 2:35 pm
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Last edited by tinker tech on Wed Jul 29, 2009 10:10 am, edited 1 time in total.

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Posted: Fri Apr 11, 2008 6:55 pm
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Thanks for the replies guys. I'll check it out.

One thing also is I get a rather loud Pop when I turn the effects on and off (whether my gmajor is plugged in or if I'm just using it as a boost). I've checked cables and everything so it is definitely the amp. The loudness of the pop can vary sometimes its very loud, and other times its rather quiet.


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