Maestro - FZ-1  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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LucifersTrip
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Post by LucifersTrip »

I did a bunch of searches and can't seem to find conclusively the correct schematic for the original 3v FZ-1. Which is correct?

It's a little different all over the place, but these seem like the best shots with the 56K's in different spots:

From forum:


...and this originally did not have the 470K and someone commented that is was missing:
Image

In the first, what's the purpose of the 56K & 10K in parallel? Did someone run out of 8.5K's?

thanx

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Post by jrod »

Well, now that you've pointed it out, shouldn't that 56K resistor be connected between the 0.0033uF cap & the volume pot's lug 1 to ground in the first schematic?

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Post by LucifersTrip »

jrod wrote:Well, now that you've pointed it out, shouldn't that 56K resistor be connected between the 0.0033uF cap & the volume pot's lug 1 to ground in the first schematic?
yes, i believe so...as shown in the the 2nd schematic

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Post by jrod »

Yeah, I just had a look at the patent and Jack Orman's schematic matches it with the corrected 470K resistor. The first one from Fuzz Central must be incorrect...still.

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Post by royaltoots »

guilty as charged - I noticed this mistake some time ago, but forgot about it again - final correction done!
remember - blue border = wrong, purple border = right

Image
Maestro Fuzz-Tone FZ-1correct schem by simonm1965, on Flickr

Here's my completed build - I used a scribbled-on Orman schem to build it, so the mistake didn't make any difference:

Image
Image

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Post by LucifersTrip »

excellent...looks great....thanx for confirming the correction

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Post by Barcode »

Just a point of note, there is a "1" and a "1a" version of this circuit. One ran off 1.4v, one off 3v. They vary slightly.

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Post by RnFR »

and after all this time! :slap:

topics merged.
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Post by Electric Warrior »

never trust a fuzzcentral schematic :mrgreen:

great to see somebody is organzing the information here. :applause: keep up the good work!

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Post by spazztech »

new to the board - hello

I built a breadboard version of the FZ-1 this afternoon though I used
PNP germanium transistors with gains ranging from 40 - 49
in place of the 2n270's. probably a bad idea because I couldn't
get any thing at all out of it. any one know where ( if anywhere )
I can get ahold of some 2n270's ?

thanks -

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Post by ringworm »

A quick question about the correct schematic posted 6 posts above (the pink one).
Is that a junction after the first 20uF capacitor? Or does the signal from 470k to 2k2 not connect to the signal from the 20uF?

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Post by jrod »

ringworm wrote:A quick question about the correct schematic posted 6 posts above (the pink one).
Is that a junction after the first 20uF capacitor? Or does the signal from 470k to 2k2 not connect to the signal from the 20uF?
No, the 3 components in question connect together to the base of the 2nd transistor.

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Post by ringworm »

Thanks for that.

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Post by kzustang »

HI everybody,

reading the remarks on Glen's original patent states that the "missing" 470k resistor is actually a 470 Ohm resistor used for avoiding temperature problems on Q2.
can anyone verify that? 470R or 470K. the drawing in the patent designates this resistor as numbered 261 (probably because it was added later).

he also mentions that Base and Emitter voltages on Q1 should show a bias of -1.5V and a -3V bias on the collector of Q2, probably using a 1mA leaky 2N270 transistors.

I really want to build this pedal and it seems very hard to get the Voodoo out of this circuit and demistify the legendary sound.
Can anyone post a schematic with newer transistors which can be bought from SMallBear and change the circuit to get the right biasing on Q1-3?

THanks for the interest.

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Post by Electric Warrior »

kzustang wrote:HI everybody,

reading the remarks on Glen's original patent states that the "missing" 470k resistor is actually a 470 Ohm resistor used for avoiding temperature problems on Q2.
can anyone verify that? 470R or 470K. the drawing in the patent designates this resistor as numbered 261 (probably because it was added later).
Image

470k

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Post by kzustang »

well, this certainly looks like a 470k resistor.
Thanks man, I just finished breadboarding this circuit with trimmers on all 10k resistors and also a 20k on the 1.5k.
I did get a nasty buzz distortion which means I am in the right direction. I used some leaky AC128 trannies.
the fuzz pot still doesn't seem to work as it should because it has no effect whatsoever.

I'll try some more fiddling about and post my results.

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Post by royaltoots »

what is the hfe of your current transistors? - i think i got mine going with around the 70-90 range, they don't have to be high gain (or leaky) in my experience. i was never one for checking voltages though. it's not really like a "proper" fuzz sound, you should get crude blasts of blatty fuzz, with a fast decay, and it will sound better with higher output pickups.

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Post by Rolbista »

Could someone post some pictures with enclosure dimensions marked on them? I would like to make a repro enclosure and I would like to do it with accurate proportions. Pretty please.

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Post by John Lyons »

These are made with the same dimentions.
Might save you some time.
http://www.pedalenclosures.com/Products ... fault.aspx

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Post by Rolbista »

That's nice, but the point is I have a lot of time and i like tinkering with metal. Besides, shippin would probably cost me more than the enclosure

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