GM Fuzz Up FM-3B

[edkoppel]

It's rare that we get to post new stuff in this thread anymore, as I feel like between all of us
we have displayed most of the fuzzes made from 1962-1980...

but this week I scored an original GM Fuzz Up FM-3B!

Haven't had a chance to get her going yet, but there was this little surprise hiding inside:



I'll figure out pot dates and all that good stuff soon///

[univalve]

Awesome!
I like that aerovox logo btw.

[peps1]

So, it is a Maestro FZ1 with a smaller output cap

What transistors are they?

[edkoppel]

the transistors just say,
"TR-51"

so, not sure how accurate this is, but the pot dates this to 1963!

which would make sense,
as it's an FZ-1 copy and also they were located in Detroit
and Gibson/Maestro was in Kalamazoo.
sweet.

[daCod]

nice job sir! anxiously awaiting more

[Rygar]

That's cool, thanks for the info!

[Officer Bukowski]

I think there's a mistake in that schematic. It shows the input going straight to ground before it hits the circuit, which should result in no sound.

Very interesting pedal though. My jerms FZ-1 is definitely my favorite fuzz, so I'm intrigued by all things FZ-1

[Stu]

I think there's a mistake in that schematic. It shows the input going straight to ground before it hits the circuit, which should result in no sound.

Look again, that's showing the shield being grounded.

[SonicVI]

looks like a '61 date code on one of the caps. What are the codes on the electrolytics (6??6)?

[FUZZTX]

Very cool! Can't wait to hear how she sounds!