Allright, they sent me a schematic, no parts list so doesn't do any good... It worked fine when I recived it, all new sprague caps, etc.. was reworked.  Then it started haveing problems when switched on.. 1.It has a three way on-off-on switch- the schematic does not show if it has an internal breaker.  2.  The two main capacitors- one checks out, the other shorts out...but I have no part number and you try calling Gibson and see what they say...LOL! "We don't make them any more..."   Anyone know what the cap and switch are and where to purchase them... I'd replace both large caps....I don't see a number on the liners.... Thank you....

I'm looking for a schematic...or if anyone knows the proper fuse for this amplifier.....I took out a Buss MTH4 and replaced it with a fast burn 5amp (all I had on hand), which works fine -Cleaner for some odd reason with no tube drain sound on shutting off.
One great sounding clean amp...expermented with a few 12ax7 tubes and found the old RCAs give it a warm, even sound-newer brighter with a more fender solid state sound...didn't know they would make such a vast sound difference in overall use...  Have another amp problem I'll post..

OK, its the HD mixer, but I can't find any information on the three way switch... does it have a bulit in 15 amp fuse?  Why does it need it?   Can I rewire to a two way safely or is there a specific reason for this switch?  ...  THank you

Ok, been reworked once...sprague caps etc..but out of nowhere started feedback-tap on faceplate by on/off 3 way 6 pole switch...and hum would stop- then intervals became closer.. checked everything, switch OK, breaker OK, caps- one seems to register higher than the other on the duel 1013-725 50vcds... but also now_ transformer hums, with or without speaker... ideas?  also:  How to test transformer?  And the gp100 schematic does not show the same switch...