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JCM800 Lead series 100W combo

3/27/2006 6:53 AM
JCM800 Lead series 100W combo
Iam having trouble with my JCM800 combo. When you plug in and play it seems to just have no volume (even when volume is turned up). Though everynow and then at random times all of a sudden the volume kicks in and it works great. Also sometimes if it has no volume and the amp gets bumped the volume will increase (after some disturbing noise).  
Any slight ideas of what to check out first?  
thankyou very much
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