Rogue Fuzz (Goya Fury -> Guild FW-3)

[devnulljp]

Alrighty then. Snagged this on fleabay for $pretty_cheap. Sounds like a very angry Japanese Giant Hornet in an oil drum. Leaning toward the Maestro, Orpheum, and Fuzzrite buzz box kinda sound. Real gnarly garagey 60s sounding fuzz -- although the pot codes put it at 1972ish? (pots read 1132722 / 304 V 7226, which I think is Stackpole 1972 week 26? The other one is some manufacturer part code?)
I know D used to have one of these, and according to analogguru, it's a member of the Applied, Conrad, Goya etc. family and the missing link between the Goya Fury Box and the Guild FW-3 (one of which I just missed on ebay for next to nothing ).

EDIT (thanks Stu): Trannies are a mystery TI marked "5781 606F"(Si, PNP?)and a 2n5172 (Si, NPN).

Pretty cool.

[Creepyfingers]

Ha!

Dig the PTP.

[Stu]

Both transistors are silicon. 2N5781 is PNP, 2N5172 is NPN. What are the values of the ceramic caps and the green mylar one?

[devnulljp]

The two ceramics read
SK
2X
10V

The green mylar is 022
(50V 022 +/- 20%)

Both of the blue caps are 0.0047 (400V 10%)

Cant see anything on the pots, I'd have to desolder to take a reading

[Creepyfingers]

Ya know I can't picture how that second transistor is supposed to function at all. Its emitter is tied to ground (negative) and its collector is tied to the positive supply via the "sustain" pot. If its PNP it the base emitter junction would be reversed biased. My theory is that "5781606F" is possibly a Texas Instruments house numbered NPN. I think it might just be a coincidence that the first 4 numbers show up as a PNP when you put 2N in front of them. Of course if I've got the emitter and collector connections backwards and it was set up as a emitter follower it would make sense but it doesn't look that way from the pics.

[devnulljp]

If it's NPN 2n5781, it should be E-B-C right?

[Stu]

{edit} I think you're right Brad. Now I've drawn a schematic from the layout, it looks as if it ought to be NPN germanium, with the collector to the sustain pot? Can't see it being silicon with only a collector resistor and one from base-ground...

[jerms]

sorry for the shitty pix!!

[Creepyfingers]

Looks like emitter to sustain pot to me. I have a circuit drawn out, but I haven't had a chance to test it.

In both versions I see the emitter tab facing the grounded lug. You can see it above the Texas Instruments logo and to the left. For the emitter to be connected to that sustain pot the legs of the transistor would have to cross over. On the overhead shot you can see the transistor leg closest to the tab connected to the second lug (which is connected to the grounded lug next to it by a jumper) all the legs are connected to their adjacent lugs with none crossing over.
I actually have some house numbered NPN germanium Texas Instrument transistors in the TO-5 package that start with the numbers 5582 but a 2N5582 is a NPN silicon...

[Stu]

Edited the previous post, it doesn't look like a silicon PNP not I've drawn a schematic...