Quote:
Originally Posted by Jaybird
No actually I had it on pin 8 and it sqealed without anything in the input. It began to squeal as soon as the amp warmed up. I did ask about what looked like a resistor going into pin 7 on the pic you posted of the NFB mod. Right now the 22pf ,1 megbypass along with the .1 caps and the amp is sounding pretty sweet. I just finished building a 5F1 tweed clone and they are both a lot alike. I think the 5F1 is a tad better for harp, A little more grit, or honk. The GA-5 has got the juice. Using them with a DD-3 delay and the sound is real full for both amps.
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Yeah, that's the weirdest thing. It's a 1.5k resistor, that was installed by the factory. I haven't read where anyone else's GA5 has this. The only thing I can figure is that it was a mod they did, possibly due to instability caused by that high pass filter they're installing on these. Maybe some individual amps gave them trouble, and they installed this mod if needed. But I really don't know.
I removed the resistor, and the amp is louder (as expected) and a bit brighter, but still stable.