Dead OCM 55...

It is a very simple circuit.

If one channel is working, that becomes your reference voltages for testing against the dead channel. Problem areas should take minutes to find.

[IMGDEAD]http://im0.olx.biz.id/images_olxid/4146326_4_644x461_pre-amp-flat-ocm-55-made-in-usa-elektronik-gadget.jpg[/IMGDEAD]

Only the switches and pots are soldered in a way that chassis flexing/vibration could cause grief...and their solder junctions and overall continuity can be inspected.

On a scale of 1 to 10 in complexity of trouble shooting (easiest to most complex), A preamp this simple is somewhere down at the 3 range.

There are apparently two versions? If it is the following design, the simplicity remains:

IMG_1918%5B1%5D.jpg
 
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