well im looking into a old randall cpa-4 amp im guessing is from about the late 70's or so.
it has an issue after it warms up ( it has been in service in our local eagles for years as a pa system) and it gets super sensitive and make s a feed back noise. only way to get it to stop seems to be to turn it off for around 30 seconds and then turn it back on till it acts up again.
this devil is way newer than the stuff i am used to fiddling with and was wondering if anyone might know where a schematic might be found and/or if they have any experience with this unit
the story goes that it was used as a amplifier stage when they had an old jukebox and they had it wired to feed 5 or 6 speakers at one time, then after they disposed of the jukebox the wired the speakers so they could use it as a pa sytem in the building.
thanks in advance all