The amplifier in my rockola 480 has lost the right channel...I've found Q11 and Q12 transistors are grounded on both the emitter and collector. The parts guide just describes then as "power tab (npn) red" and "power tab (pnp) green". I'm trying to source some replacements but hav...

Thanks Ken, I figured it was something like that. Well, i'm going to have to assume that all the mods i see are from the service bulitin then. On to repairing then..YAH!

I have a Rockola 480. The Credit unit appears to be dead. Does anyone know why the mods were done on the #52225-1A credit boards? I've seen three now and they all have the same mods done. Jummpers, removal of resisters, trace cutting as well as a couple of capacitors added. I was thinking of rebuild...

Here's an exploded view from the parts manual. Hope this helps.