Quote:
Originally Posted by androo
Hey folks :)
I hate to bring this awesome discussion back to elementary level (but I am a first grade teacher!) Anyway, I've gotten all the goodies I need to do the 3 original electrical mods you talked about, but now I'm balking. Chalk it up to inexperience. Could you break those 3 down fer me? What effect can I expect for each one?
The lifted cap
The jumpered resistor (1m + 22pf cap)
The NFB
Again, sorry to be so elementary! I am in love with my amp as is, and now I realize I may be getting swept away with results I'm not even sure of!
Duh ;)
droo
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If yer happy with the GA-5 as is, don't bother with any mods.
There is no way to fully describe what the trinity circuit mods will sound like for you - lots also depends on the kinda guitars/pickups you plug in, and what and how you play.
The trio of circuit mods will remove that shrill boxy tone, allow for a fuller 'n' fatter tone, greatly reduce hum ... this basically somewhat lessens the raunchy, overly trebly "tweed tone" to a more manageable level.
Just do all three at the same time, they compliment each other and they are way too easy to accomplish, OR to undo ...
The lifted cap - cut the jumper, as shown
The jumpered resistor (1m + 22pf cap) - solder a wire across those turret terminals, as shown
The NFB - add a 47k resistor from the yellow wire on the RCA jack to pin 8 of the 12AX7 socket, as shown
