Author Topic: Working on a Big Muff (Green Russian)  (Read 1381 times)

sgmezei

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Working on a Big Muff (Green Russian)
« on: January 21, 2012, 09:13:53 PM »
Alrighty, so a buddy gave me his Green Russian BMP to replace the broken battery snap. No problem I say. I want to put in a dc jack on the back for our usual wall wart setup.

I know there are a ton of versions and I came across a thread stating some of them were Positive Ground. I am frustrated going through a million threads so hopefully I can get some help from my Comrades here.

Is this a positive ground effect? It is made in Russia and has the massive green enclosure. I measured the positive and negative on the board and it reads normal to me. I put red probe on red battery snap wire and black on black. Even the PCB has + where the red wire is and - where the black is.

I just don't want to mess it up. It is a good buddy's.

jkokura

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Re: Working on a Big Muff (Green Russian)
« Reply #1 on: January 21, 2012, 09:46:13 PM »
Positive ground? Not likely. Perhaps PNP instead of NPN, but not positive ground. At least I've never read that. Got a link?

Jacob
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sgmezei

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Re: Working on a Big Muff (Green Russian)
« Reply #2 on: January 22, 2012, 12:50:27 PM »
Okay now I cannot find the article which states it is Positive Ground.

So I am going to go ahead and wire it with the normal madbean wiring method.

Anybody see any issues with this? Jacob?

jkokura

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Re: Working on a Big Muff (Green Russian)
« Reply #3 on: January 22, 2012, 05:41:36 PM »
nope.

Jacob
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sgmezei

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Re: Working on a Big Muff (Green Russian)
« Reply #4 on: January 22, 2012, 10:55:03 PM »
All is well. Worked like a charm and was totally normal. Thanks for the input Jacob.

Scruffie

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Re: Working on a Big Muff (Green Russian)
« Reply #5 on: January 22, 2012, 11:10:49 PM »
There was one model of the Big Muff that was positive ground, wasn't a Sovtek though.

The positive thing probably comes from the fact the old phono DC jack sockets they used were wired for positive tip, not ground.
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