Schaller - Fuzz  [schematic]

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

Also in a package; a non working Schaller fuzz

Image

Image

Schaller fuzz schematic from Analogguru's site; this version differs though:

- No C3
- C5 = 10 uF

Unit works now; sound sucks though :) Transistors are BC (no further marks).
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Schaller Fuzz 1972 schematic
Schaller Fuzz 1972 schematic
schaller-fuzz-schematic.gif (8.01 KiB) Viewed 318 times
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seniorLoco
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Post by seniorLoco »

:shock: Is that 4pdt switch ??!
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Bernardduur
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Post by Bernardduur »

seniorLoco wrote::shock: Is that 4pdt switch ??!
No a 4PST switch
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seniorLoco
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Post by seniorLoco »

ahh yup ... looks cool tho :lol:
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modman
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Post by modman »

Great pics BD!

I have a similar patient here Schaller too, didn't have the chance to post.
There a good chance that replacing the polarized electrolytes top and bottom by new ones will make a considerable difference, but check the voltages to we know what going on in the gain stages.

Case plastic too?
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Bernardduur
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Post by Bernardduur »

I think so too yes.... but the owner won't let me! He likes the sound, dunno why :)

Voltages:
V+ = 9.03V

Q1:
C = 2.05
B = 0.63
E = 0

Q2:
C = 4.75
B = 1.69
E = 1.05

And yes, plastic case, metal underplate
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Post by analogguru »

- No C3
possible, but C3 always was mounted on the solder side on all units I have seen.

analogguru
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NickS
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Post by NickS »

Welcome back, AG! Hope all is OK (see "AG content" thread in Members).
Good grief, that Schaller fuzz uses components I still have in my box. Those electrolytics....

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Post by Bernardduur »

analogguru wrote:
- No C3
possible, but C3 always was mounted on the solder side on all units I have seen.

analogguru
I checked when I got the unit if the C3 wasn't on the other side. It's not there :). Sounds pretty nice on high volume btw!
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Post by MoreCowbell »

Pics of a different unit....

Image

Image

analogguru
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Post by analogguru »

That´s the older ge-transistor version probably with 2 x AC 192.

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Post by MoreCowbell »

analogguru wrote:That´s the older ge-transistor version probably with 2 x AC 192.

analogguru

I'm trying to buy it from the owner (bypassing the auction). Its a non working unit...I'm sure its just a fuzz face variation, but I'd still like to own it.

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modman
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Post by modman »

Here are some pics of the older Ge unit, which might have gone under the name 'Fuzz Booster'? At least that's how this unit was listed on Ebay.
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Fuzzbooster03.jpg
Fuzzbooster02.jpg
Fuzzbooster01.jpg
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Post by fosnal1950 »

It's one of the worst sounding fuzzes I know by modern standards - I used to play one back then !!

Alf

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Alex Frias
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Post by Alex Frias »

fosnal1950 wrote:It's one of the worst sounding fuzzes I know by modern standards - I used to play one back then !!

Alf
Hummmm... I think now I'm into it!!!

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Post by plexilover »

Are the guts this one of the running version?
A friend of mine has got one, not working, wired it the same way, components ok, no sound just humming...

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lolbou
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Post by lolbou »

Some more guts showing different PCB placing and missing/removed part. These two units are currently for sale on a french ad site, both for around 150/200€, both claiming to be stock (which looks like a lie)... The enclosure style is different too.
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Schaller fuzz - guts2.jpg
Schaller fuzz - guts.jpg
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