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Laney GH50L guitar amp head and cab. The bypass switch works fine but suddenly the insert/side chain positions for the FX loop has stopped working resulting in the volume dropping so low and sounding so tinny with no effect being added either. Is there anything I can do myself to fix this or am I looking at a daft repair bill?

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The symptoms are common to a capacitively coupled signal which is often a bad switch on an insert jack that is bent so as to not contact the signal to pass it to the power amp.

The jacks on MANY of these amps are plain JUNK. If a cable is yanked a bit it can bend the spring contact. When the conttact is very close, but not touching, the capacitance will pass the high frequencies but not the low and ALL frequencies will be very attenuated.

Posted on Oct 10, 2009

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Posted on Jan 02, 2017

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