Per the suggestion of Duck Arse, starting a new thread with a few pictures of the 3-knob version of the manny's fuzz.






The tone knob on the fuzz seems to be wired like the tone knob in a fender-style guitar circuit; the wires are a tangle, but as best I can tell it attaches to one of the lugs of the footswitch, along with the wire headed to the volume knob's wiper.

I'll leave it to someone with better knowledge of vintage pot codes to decipher the value as there's nothing printed on the component.

I'm not sure if there's much I can do to get the board out of the case without destroying something, but I can give it a go if there's anything on the bottom of interest (looks like at least one cap and one resistor under there as far as I can see).

Also, I realise it's not super clear form the photo (sorry) but the wire to the tone knob goes to lug 1; lugs 2 and 3 are bridged, and the cap goes from 2/3 to ground.

The board support brackets are really clever.

The sides of the case are made of wood!

Great pics!   So this is the same circuit as the Orpheum ?

Here's as much as I can work out see bottom for missing info.
Some of these items would be very easy to check on the real unit, the limit for me is the camera angles.


Reference schematic:


Using analog guru's (Ge) Opheum Fuzz Schematic as a reference.
This is reported to have a bug of C5 as 5n instead of 1n.
*** However, I suspect C4 might be 1n and C5 is 5n.





Halifax Fuzz


Looks identical to Manny's Fuzz.   Some Manny's fuzzes use poly caps instead of ceramics.

Similar to Orpheum Fuzz. The main difference is the addition of a Tone pot.


Parts:

Q1   GC991, 517   ;TI, TO-5 package
C1   50n cer
R2   10MEG ?
R1   22k

Q2   4349, 5168   ;TI, TO-5 package
C2   50n cer
R5   1M
R3   47k
R4   47k
C3   100n poly

C4   1n cer
C5   5n cer

R6    cannot see maybe under another component
   or wired off board?


Additional parts
C7   5n cer
P3   Pot Tone


Pots: (left to right on front panel)

   Volume      P2, value?,
         wired as per Orpheum schematic

   Boost      P1, value?,
         wired as per Opheum schematic
         clockwise (pin 3) to C4?
         counter-clockwise (pin 1) to C5?
         output on wiper (pin 2)
   
   Tone      P3, value?
         Tone pot counter clockwise (pin 1) connects to wiper of Boost pot
         Tone pot clockwise (pin 3) and wiper (pin 2) connect together then to C7.
         other side of C7 to ground.
   
Missing info:

   - Pot values and tapers
   - Confirm R6 present and value
   - Boost pot clockwise/counter-clockwise connections

Hanging issue:
Which of C4 and C5 is 1n and which is 5n?

i love/hate that bypass technique!
i would guess that the 1n is comming off of the 2nd gain stage, but that's just how i'd design it, the reality might be the other way around

cheers

Quote from: mdcmdcmdc on June 15, 2021, 07:06:32 PM
The sides of the case are made of wood!

are they 'look at these wooden sides' wooden sides, or are they 'it's got wood for the sides' don't look at them wooden sides?

Quote from: duck_arse on June 17, 2021, 11:08:11 AM

Quote from: mdcmdcmdc on June 15, 2021, 07:06:32 PM
The sides of the case are made of wood!

are they 'look at these wooden sides' wooden sides, or are they 'it's got wood for the sides' don't look at them wooden sides?

Definitely the latter.

It's funny, I bought the pedal a couple years ago for I want to say $75 solely because it says "Halifax" and that's the city in Nova Scotia where I grew up. I didn't realise it was actually a manny's fuzz in disguise.

I'll open it up again this evening and see if I can get the board out of the case without destroying anything. I think the straps holding it on are just folded over a hook iirc, not riveted in.

I found a pic of an Orpheum PCB and C4 is 1n ie the cap connecting to Q1's collector.
The C4 cap is the one at the middle-edge of the PCB.
The Orpheum and Manny's all seem to use the same PCB.

I can't see R6 on the PCB, if present it must be wired off the PCB.

Quote from: Rob Strand on June 17, 2021, 03:13:37 PM

I can't see R6 on the PCB, if present it must be wired off the PCB.

There are definitely a couple of danglers hanging off the bottom of the board.

OK, managed to get the board out without any trouble:



Full set of photos here:

https://imgur.com/a/3n3NQwO

Let me know if you need anything else.

QuoteOK, managed to get the board out without any trouble:

Cool,  I couldn't actually open the album page of pics.

However from the last pic I can see the some of the missing pieces:
- 22k resistor (R6 on the schematic) wired to pots.
- C4 is definitely the 1n cap and goes to the clockwise terminal (pin 3) of the Boost pot.
  (That leaves C5 at 5n)


So the hanging stuff.

The pots.

I managed to decode the Tone pot to be a centralabs brand.  The first line identified centralabs and manufacturing date of week 34 in 1961(!).   Unfortunately the second part of centralabs pots are often OEM codes and may not even have the value in there.   Most of the info on these is for Gibson guitars and the second part is a Gibson code.    My best guess is 270V1 is some sort of model series number and 10H06 is at best some sort of coding for the value.

I guess one useful thing would be to see if any of the pots have the same marking 270V or 10H06.  At least that will let us know which pots are the same.  Some units have a 100k volume pot.    Given the small value of C4 the Boost pot could even be 1M.   All guessing though.   Ideally measuring the pots would give the values.

The Boost pot could be measure in circuit across the outer terminals.  Measure with boost pot at both extremes.  One of the measurements will be the pot value.

The Tone pot can also be measured in circuit across the outer terminals.  Measure with boost pot at both extremes.  One of the measurements will be the pot value.

The Volume pot can also be measured in circuit across the outer terminals.     The effect of the 22k resistor needs to be removed after the measurement.


The Transistors.

I'm not sure if these are silicon or germanium, PNP or NPN.    I guess a very useful piece of info would be to set the pedal to non-bypass mode and measure the transistor voltages.   The emitters will be at zero volts.

Sorry about the bum link!










I'll dig into the other stuff tomorrow

Trying to find out about this transistor......
Black & white brings out the lettering a bit more.

QuoteSorry about the bum link!

Thanks for posting the images. I thought it was me.  Sometimes I have trouble with that image server.

From the pics I could confirm the battery and switch wiring follows the Analog Guru's Germanium schematic.
The battery negative goes to the transistor collectors via the power switch, so the transistors must be PNP's.

So are they germanium?  Likely but not definite.

As for the GC991 transistor, TI made GC prefix transistors in the 60's.
The small number of samples I've seen are PNP Germanium.
Definitely not equivalent to 2N991.

One 1960's TI reference I have says G = germanium and C = consumer but it is not in the context of the part number.
Nonetheless it could be true.

I would guess these are low gain.

Pot measurements - sorry it took me a sec, busy couple days...

vol - 22.6K
boost - 254K
tone - 530K

I also have some TI transistors with that prefix "GC" , some are PNP and i do have a few of the NPN also. They seem to be one of the few makers back then who were making NPN in germanium. As for the other transistor, i have some with various 4 digit codes also and some with only 3 digits. The date codes were often 4 digit, ex. 6320, but appears late 64 they went to 3 digit codes then later in 67-68 they were using 4 digit date codes again.

My TI engineering transistor book is from 73' and is totally silicon. I wish i could find a early germanium book as they tell you chip die numbers and such.

That being said, these Manny fuzzes and so many other names all appear to use a mis-mash of whatever parts they had, i have not seen 2 alike inside.

QuotePot measurements - sorry it took me a sec, busy couple days...

vol - 22.6K
boost - 254K
tone - 530K

Very cool.  Fairly convincing the Boost pot is 250K and the Tone pot is 500k.

The Volume pot looks is totally swamped by the 22k resistor tolerance-
to the extent where the value of the volume  pot cannot be calculated  .
It's not looking like the normal 100k but 250k or up is possible.

When you measure the Volume pot measure across the outer terminals
but you will need to adjust the *Boost* pot to the extreme which makes
the Volume pot measurement the highest.  You might expect something
like 130k or higher.

I'm real curious to see how the "boost"  control / circuit works.