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HardCorps88

Spider IV 75w Tone Change on its own

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My amp when playing will switch tones like it loses its base and comes back when I move the knob then switch it back for example to Insane or any other tone.  Cable is good....connection on guitar is good as well as I chked it against my 15w.  Any 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.

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