randall 1992 12" guitar amp noise cutting off

[manny2112]

a while back my randall amp starting cutting off
at first the distortion ch. would start to leak into the clean ch.
making it sound just slightly distorted......I always had the selector switch set to clean so i dont understand why the clean ch. would leak distortion

after a while the volume began to decrease...if i held the reset switch in the back for about 20 sec. all would be normal again
this stopped working after a while

now i can barely hear my guitar at full volume on the amp
all that remains is a whisper and some crackle

sometimes out of nowhere it will start working but no longer than 1 hour or so

it has no tubes whatsoever
no fuses that i can see
(ill post a pic of the inside as soon as i get it opened)

i sent it to a friend and he said the volume pots were dirty as well as the inputs...he said there was alot of grime
he said the speaker was in near perfect condition
it worked like if it was brand new but only lasted a week

im a newb at amp repair and I would appreciate any help
thanks for your time!

[manny2112]

i took these pics
the soldering my friend did looks solid




again i see no fuses

[Enzo]

Try this: take a spare guitar cord and plug one end into the effects send jack, then plug the other end right back into the effects return jack. If this restores the sound, then the return jack needds service or replacement. If the amp has a pair of jacks marked preamp out and power amp in, you can do the same test with them.

Put the amp back together first.

[manny2112]

OMG!!!!!!!!!!!!!!
holy crap! its working like if its brand new again!!! except for a low buzz
but as long as i get ear blowing volume its not that big a deal
damm thanks enzo I owe you one !
this thing was out of comission for like 2 years hahahhaha