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Russian EHX Big Muff Pi - inside view


bushman7771
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Hi

I've just bought this unit and was very happy.

Unfortunately it looks like someone has tamper with effect and rewire the connector switch ?

There is 9 pins at the bottom of the footswitch.

1 pin is wire-free
1 cable is joining 2 pins
2 cables are going to 1 pin

rest is 1 to 1

has anyone got this unit and can advise or attach the photo.

Thank you very much for your time.

Mac

Edited by bushman7771
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The wiring loom inside those old Russian Muffs is notoriously fragile. Kit Rae's interwebsite is pretty much THE authority on all things 'muff', chances are there's some wiring diagrams on there.

Something like [i]this[/i]...

[url="http://www.kitrae.net/music/Images_Secret_Music_Page/V8_Wiring_Diagram.pdf"]http://www.kitrae.ne...ing_Diagram.pdf[/url]

What you've got inside yours is an attempt to make it a 'true bypass' Muff - the originals only had a double pole, double throw (DPDT) switch, and to do true bypass with an LED you'll need a triple pole, double throw (3PDT), which is what you've got. The good news is that it's entirely fixable, although while you're inside it I'd recommend rewiring with sturdier stuff. If you're feeling up to it...

Edited by paul_5
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[quote name='paul_5' timestamp='1409173757' post='2537203']
The wiring loom inside those old Russian Muffs is notoriously fragile. Kit Rae's interwebsite is pretty much THE authority on all things 'muff', chances are there's some wiring diagrams on there.

Something like [i]this[/i]...

[url="http://www.kitrae.net/music/Images_Secret_Music_Page/V8_Wiring_Diagram.pdf"]http://www.kitrae.ne...ing_Diagram.pdf[/url]

What you've got inside yours is an attempt to make it a 'true bypass' Muff - the originals only had a double pole, double throw (DPDT) switch, and to do true bypass with an LED you'll need a triple pole, double throw (3PDT), which is what you've got. The good news is that it's entirely fixable, although while you're inside it I'd recommend rewiring with sturdier stuff. If you're feeling up to it...
[/quote]

The later Russians I believe had the 3PDT switch but were still not "true bypass". To achieve that you have to cut tracks on the circuit board. The wiring and pots on these pedals are terrible though and will definitely benefit from better parts.

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