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Old 23rd Feb 2012, 10:12 am   #4
peter_sol
Octode
 
Join Date: Aug 2003
Location: Welwyn Garden City, Herts. UK.
Posts: 1,906
Default Re: Growling, howling, shrieking guitar amp

It sounds as if the controls just need a squirt of switch cleaner.
High gain amplifiers often squeal instead of just crackle.
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