[Guitarslinger1]

Originally Posted by Rob DiStefano

GA-5 problem ... and solution.

Weeks ago I posted that after lotsa active and aggressive "testing" I had damaged the stock Sig 8 speaker - it was farting out with a heavy attack, particularly on the bottom end.

The new Weber 8F150 speaker arrived and, yep - same problem, farting out when pushed hard. Something had happened, or was happening, with the circuit.

After going over the mods already accomplished, doing a buncha testing, and conferring with Paul, there were several things to try.

What I did first was to add a 1.5k resistor between the preamp socket pin 8 and the shielded signal wire off the vol pot. This is the way some of the stock GA-5 amps are setup. Paul thought it might have been added by Gibson to cure some parasitic issues. Well, it fixed my GA-5, no more farting out, and the tone really blooms out as both the Jupiter caps and Weber are "breaking in".

Something to take note of and keep in mind if yer GA-5 develops a severe case of "gas".

You mean pin 7 right?

Yeah, there had to be a reason some of these amps came out of the box with that resister installed...and you found it!