Maestro FZ-1B circuit photos

[Dragonfly]

Thats the one I got some of the missing values from for the unit pictured.

We have 3 different versions in this thread !

[smnm]

Even though it says FZ1B on the factory schematic, isn't the 4 transistor version with the Balance pot the FZ1S?

Looking at it, it kind of looks like FZ18 on the printed schem, which could be a transcription mistake - S to 8? just a thought.

[Dragonfly]

Even though it says FZ1B on the factory schematic, isn't the 4 transistor version with the Balance pot the FZ1S?

Looking at it, it kind of looks like FZ18 on the printed schem, which could be a transcription mistake - S to 8? just a thought.

It came from inside this fuzz... so it should be a FZ-1B. The FZ-1s uses an entirely different case.  It may be a later, transition one however....








Here's a glimpse at the FZ-1s schematic (inside the FZ-1s casing...). It's quite a bit different than the schematic shown for the FZ-1B

[Mark Hammer]

I have a populated FZ-1S board that I was given and have wired it up.  What I can get it to do is decent, but I suspect there is something wrong with one half of the dual-ganged pot.  Rotating in one of the two directions gets me no output at all.

I built myself an FZ-1B from the Maestro schematic using 2N3392 transistors.  I have absolutely no idea how they would be different than the 2N3860.  I found the sound ...okay, but not particularly inspiring.  I forget whether I used a GE or SI diode.

And as a side-note, do not depend on the visual features of the diode to identify which type it is.  I have some big clunky glass ones that are SI, and have some teeny orange-with-black-stripe ones that look for all the world like Si but are 1N60 GEs.

[g3rmanium]

Values of the pots, caps, and the transistor #'s ?

Does the orange wire go to lug 3 of a gain pot ?

I'll check the pots. The capacitor values and the transistor number are visible, I thought?

I'll post some more photos.

[Dragonfly]

Values of the pots, caps, and the transistor #'s ?

Does the orange wire go to lug 3 of a gain pot ?

I'll check the pots. The capacitor values and the transistor number are visible, I thought?

I'll post some more photos.

transistor # is only partially visible.

the caps are not visible except for one that "looks" like a .15uf

I just need confirmation that the schematic Ive drawn has the correct values for the electros, transistors, and ceramic caps...

the diode would be nice to know too...but i think you mentioned that you were having trouble getting an accurate forward voltage reading ?

[Dragonfly]

some possible mods....

[Sir H C]

Measured .634 volts across the diode.

[Dragonfly]

Measured .634 volts across the diode.

cool...silicon it is...thanks.

[g3rmanium]

transistor # is only partially visible.

Transistors are 2N3860.

the caps are not visible except for one that "looks" like a .15uf

The caps are 5 µF 12 V -10 + 100. The ceramic is Y5U 50 V, the other one .15 +- 30 % 12 V.

I just need confirmation that the schematic Ive drawn has the correct values for the electros, transistors, and ceramic caps...

I'm not so sure what the switch is doing. I think it just switches the diode into the circuit. The white wire goes from before the diode to the top lug of the balance pot, middle lug of balance switch goes to top lug of volume. Low lug of balance goes to ground.

Here's one more photo.