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crispyaaron

Automatically changing tones

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So while playing on my Spider IV 150, it will start changing tones quickly like I am turning the knob.  Will do this after 30 minutes to an hour of playing.  Ani ideas?

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Could it be that loose knobs are turning from vibration?  I have read that some people add a small oring under the knob which gives some resistance to turning them.  But I have also heard at least one time of someone having a simialr issue, which because ti was happening after some time of the amp being on, indicated overheating of a component (or possibly abad solder point).

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