Catalinbread - Karma Suture (germanium & silicon versions)  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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aionios
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Post by aionios »

An adaptation of the Harmonic Percolator with some added bells & whistles. The germanium version came out in 2014 and the all-silicon version followed in 2016. I hadn't seen details on either of them here so I traced both!

Germanium version:
Catalinbread Karma Suture schematic (germanium version)
Catalinbread Karma Suture schematic (germanium version)

Silicon version:
Catalinbread Karma Suture schematic (silicon version)
Catalinbread Karma Suture schematic (silicon version)
Full tracing journal (including photos of both versions):
https://aionfx.com/news/tracing-journal ... m-silicon/

PCB available here (supports either version):
https://aionfx.com/project/calliope-vintage-fuzz/

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Ben N
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Post by Ben N »

Hey, Kevin, nice work. The demos of these things sound really killer. What I am not hearing in any demos is the wild octavy stuff that the original Harmonic Percolators were known for, although both versions are obviously very harmonic rich. Is that in there? Also, would it be possible to ditch the input control and just use the guitar volume for that? And how do both versions play with other pedals, fore and aft?

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aionios
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Post by aionios »

Ben N wrote: 22 Feb 2021, 11:53 What I am not hearing in any demos is the wild octavy stuff that the original Harmonic Percolators were known for, although both versions are obviously very harmonic rich. Is that in there?
Not that I heard in my build or listening to the originals. Both are more along the lines of the "Albini specs" version of the Percolator where they are lower gain and more controlled, more of a textured drive than a fuzz.
Ben N wrote: 22 Feb 2021, 11:53 Also, would it be possible to ditch the input control and just use the guitar volume for that?
Definitely possible, but this input volume is actually the gain control from the original Percolator, so you'd be straying even further from vintage. For fuzzes that react well to guitar volume, I typically prefer including the input volume on-board rather than relying on the guitar. This way you always have the option to turn the control all the way up and just use guitar volume if you want, but you're not stuck without a gain control if you put the pedal someplace else in the chain where guitar volume doesn't have as much of an impact, e.g. after a compressor.
Ben N wrote: 22 Feb 2021, 11:53 And how do both versions play with other pedals, fore and aft?
Not sure on that one, but likely comparable to the original Percolator since the input & output impedance are the same.

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toneman
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Post by toneman »

Hmmm.
No path to gnd for Q1 &Q2 common emitters(?)
Definitely not a FF. Uses diodes for clipping. :-(
Tone-to-the-Bone

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Post by CheapPedalCollector »

I was also just noticing no path to ground on the Q1 and Q2, resistor missing?

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aionios
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Post by aionios »

Yep, that's the Percolator... It's a tangle of a schematic that doesn't resemble anything else, and there are a few different ways people have drawn it, but it always looks confusing. Maybe this other schematic makes it clearer though -

Image

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287m
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Post by 287m »

For you Si lover or didnt have germanium, 1590B top jack maniac, here the idea.
Thanks Aion! and all of you, stay safe.
cat-karma-si-600-dpi.png

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