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when i turn up the volume the sound either cuts out or a cracking sound hap?

when i turn up the volume on either the main or the gain ports, the sound either cuts out or a cracking sound occurs. how do i fix this ?
james, January 2010
Symptomatic of dirty pots (potentiometers / variable resistors)

Something like this is your best first approach...

http://www.rocketradio.co.uk/servisol-super-10-electronic-switch-cleaner-200ml-can-1167-p.asp

"Ideal for noisy volume controls"

Good luck...

Peccavi, January 2010