Dunwich Olde Dirty Bass

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

Just a gut shot I found online, preserved till maybe more info can be gathered.
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01A1E1D1-CFB3-4C5D-B1BC-E636D0E1EE43.jpeg

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andhony
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Post by andhony »

if I remember correctly it's a modded ocd

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V1nce69
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Roger Mayer Voodoo Bass
Idiot box Blowerbox
Hudson Sidecar

Pcb builds:
Fulltone 69 (GGG kit)
Russian Big Muff (Musikding kit)
EHX Bassballs (home etched using Topopiccione layout)
BJFE BBOD (home etched, thx FSB)
Triangle Muff (Guitar PCB board)
Deluxe Bass Fuzz (home etched,gausmarkov.net layout)
Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
Rocket Overdrive (pcb by Pepers' pedals)
Sonomatic Deluxe Tape Delay (pcb by Skidmark)
Black Arts Quantum Mystic (adapted storyboardist layout)
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Post by V1nce69 »

Yes indeed. It's an OCD modded for bass.
I have one custom etched. I should look inside and trace it.

BTW here it is next to one of others Nick's awesome fuzzes
Custom etched DUNWICH OLDE DIRTY BASS
Custom etched DUNWICH OLDE DIRTY BASS

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V1nce69
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Posts: 49
Joined: 10 Nov 2013, 08:01
my favorite amplifier: Ampeg
Completed builds: Veroboards builds:
Throbak Overdrive Boost
Wampler Ecstasy
Creepy Fingers Doomidrive
Black Arts Quantum Mystic
Roger Mayer Voodoo Bass
Idiot box Blowerbox
Hudson Sidecar

Pcb builds:
Fulltone 69 (GGG kit)
Russian Big Muff (Musikding kit)
EHX Bassballs (home etched using Topopiccione layout)
BJFE BBOD (home etched, thx FSB)
Triangle Muff (Guitar PCB board)
Deluxe Bass Fuzz (home etched,gausmarkov.net layout)
Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
Rocket Overdrive (pcb by Pepers' pedals)
Sonomatic Deluxe Tape Delay (pcb by Skidmark)
Black Arts Quantum Mystic (adapted storyboardist layout)
Location: Lausanne, Switzerland
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Post by V1nce69 »

Here is my custom Olde Dirty Bass
Gutshot
Gutshot
PCB glued
PCB glued
PCB detail
PCB detail

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V1nce69
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Posts: 49
Joined: 10 Nov 2013, 08:01
my favorite amplifier: Ampeg
Completed builds: Veroboards builds:
Throbak Overdrive Boost
Wampler Ecstasy
Creepy Fingers Doomidrive
Black Arts Quantum Mystic
Roger Mayer Voodoo Bass
Idiot box Blowerbox
Hudson Sidecar

Pcb builds:
Fulltone 69 (GGG kit)
Russian Big Muff (Musikding kit)
EHX Bassballs (home etched using Topopiccione layout)
BJFE BBOD (home etched, thx FSB)
Triangle Muff (Guitar PCB board)
Deluxe Bass Fuzz (home etched,gausmarkov.net layout)
Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
Rocket Overdrive (pcb by Pepers' pedals)
Sonomatic Deluxe Tape Delay (pcb by Skidmark)
Black Arts Quantum Mystic (adapted storyboardist layout)
Location: Lausanne, Switzerland
Has thanked: 36 times
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Post by V1nce69 »

Today I found some time to begin to tear it down.

All pots are A1M except for the Mids which is C100K.

Here are some pictures
IMG_3507.jpeg
IMG_3508.jpeg
IMG_3509.jpeg
IMG_3510.jpeg
IMG_3511.jpeg
IMG_3512.jpeg
IMG_3513.jpeg
IMG_3514.jpeg
IMG_3515.jpeg

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V1nce69
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Posts: 49
Joined: 10 Nov 2013, 08:01
my favorite amplifier: Ampeg
Completed builds: Veroboards builds:
Throbak Overdrive Boost
Wampler Ecstasy
Creepy Fingers Doomidrive
Black Arts Quantum Mystic
Roger Mayer Voodoo Bass
Idiot box Blowerbox
Hudson Sidecar

Pcb builds:
Fulltone 69 (GGG kit)
Russian Big Muff (Musikding kit)
EHX Bassballs (home etched using Topopiccione layout)
BJFE BBOD (home etched, thx FSB)
Triangle Muff (Guitar PCB board)
Deluxe Bass Fuzz (home etched,gausmarkov.net layout)
Clone Theory Chorus (Celeste pcb from lectric-fx)
Cornish G2 (home etch, layout thx FSB)
Shin-Ei FY-2 Ge version (home etched, own layout)
Klon (Aion Refractor pcb)
Mutron Phasor II (home etched, layout thx JohnK)
Sunny-T (pcb by guitar pcb)
Rocket Overdrive (pcb by Pepers' pedals)
Sonomatic Deluxe Tape Delay (pcb by Skidmark)
Black Arts Quantum Mystic (adapted storyboardist layout)
Location: Lausanne, Switzerland
Has thanked: 36 times
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Post by V1nce69 »

Tracing completed
Dunwich Olde Dirty Bass - PCB traced
Dunwich Olde Dirty Bass - PCB traced

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storyboardist
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Post by storyboardist »

Here's a schematic.
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schem.png
schem.png (10.9 KiB) Viewed 2647 times

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Nocentelli
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Post by Nocentelli »

storyboardist wrote: 11 May 2021, 20:50 Here's a schematic.
No input cap?
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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deltafred
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Post by deltafred »

Or output cap.

Bipolar supply to the opamps (no pseudo 0v bias voltage) so in theory doesn't need them. The whole circuit is DC coupled.
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storyboardist
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Post by storyboardist »

Nocentelli wrote: 12 May 2021, 05:25 No input cap?
Yeah that surprised me too. @deltafred's explanation makes sense though.

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Alamondm
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Post by Alamondm »

Verified

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