Anyone have a PNP Big Muff?

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Re: Anyone have a PNP Big Muff?

Postby jerms » Fri Jan 15, 2010 6:30 am

i think the M means motorola.... nice score dev!!! :badlove: :drool2:
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Re: Anyone have a PNP Big Muff?

Postby Sk10 » Fri Jan 15, 2010 12:48 pm

devnulljp wrote:Guy selling it said he liked it, but it was a bit too Fu Manchu for his band ... :hihi:
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Nice score!!!
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Re: Anyone have a PNP Big Muff?

Postby jerms » Mon Jan 18, 2010 9:15 pm

hey plum, i finally got some shots of my PNP triangle muff with fs37000 trannies... after taking this apart for the pictures i realized that this one has had some work done on it! :doh: some of the ceramics have been replaced as far as i can tell.... i bought this several years ago before i really got into pedals.... i never really looked at it closely, just popped a new battery i every so often. BTW this thing is probably thee best sounding of all my muffs so i don't think i'll touch it!!... very open sounding! a funny thing is that the first pedal that sent me on this fuzz frenzy was a PNP LPB-2 with the same fs37000 trannie in it (this was also the first pedal i fixed... it sounded weak with the effect engaged and found that the transistor was installed backwards. wonder if it was in wrong because it's a PNP version!! :hmm: ) i thought all these early muffs etc had these transistors.... there's also this web page... http://members.fortunecity.com/uzzfay/b ... gmuff.html that takes a detailed look at yet another PNP triangle w/fs37000, that was some of the only other info i found back then. anyway here's the pics...

i'll post a couple shots of that LPB-2 too!
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Postby redeyeflight » Mon Jan 18, 2010 10:07 pm

Not to hijack this thread but can someone explain the differnce between a PNP and a NPN transistor to me? (yes, I know nothing about electronics...)
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Re: Anyone have a PNP Big Muff?

Postby John Lyons » Mon Jan 18, 2010 11:15 pm

The only difference is the way they are polarized,
PNP connects to power with the negative end of the PS.
NPN use the positive end of the PS.
Otherwise refered to "Positive ground" and "Negative ground".
Most old transistors are positive ground (tone bender, fuzz face etc)
while all modern transistors are "Negative Ground"
There is no sound difference or sound characteristic to the NPN or PNP
difference.
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Postby devnulljp » Mon Jan 18, 2010 11:47 pm

That's a nice clean one too. Very nice.
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Re: Anyone have a PNP Big Muff?

Postby redeyeflight » Tue Jan 19, 2010 1:35 am

John Lyons wrote:The only difference is the way they are polarized,
PNP connects to power with the negative end of the PS.
NPN use the positive end of the PS.
Otherwise refered to "Positive ground" and "Negative ground".
Most old transistors are positive ground (tone bender, fuzz face etc)
while all modern transistors are "Negative Ground"
There is no sound difference or sound characteristic to the NPN or PNP
difference.

thanks John! I always heard these terms thrown around but never knew what they meant until now. So that why some older style fuzzes wont work with modern power supplies (they need positive vs negative ground) right?
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Postby PlumCrazy » Tue Jan 19, 2010 3:37 am

Thanks Jim, looks very clean, very cool
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Re: Anyone have a PNP Big Muff?

Postby John Lyons » Tue Jan 19, 2010 6:05 am

So that why some older style fuzzes wont work with modern power supplies
(they need positive vs negative ground) right?

Yes, that's correct.
When you mix pos and Neg ground pedals
with a DC jack equipped pedal you will short out
the power supply because the grounding is on
the case of the pedal in modern NPN boxes
as well as connected to the power supply.
So when you have a pedal with PNP devices
and ground connected to the positive of the
battery you connect pos to neg and it's basically
like putting a wire across the battery/pos.
Not good!
If you are using batteries for both pedals it's
fine though. Each has an isolated power source.
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Re: Anyone have a PNP Big Muff?

Postby Kitrae » Mon Feb 01, 2010 11:49 pm

analogguru wrote:Even when there have been PNP Big Muffs the problem with that picture is that those 2N5087 are not original (like some resistors in the pcb too).

analogguru


Actaully, everything on that pcb, resistors and all, is exactly how it shipped from E-H. I think the only thing done to it was a few resolders on some of the wire. E-H used both the large toostie rolls and the smaller resistors on V2 Muffs often. Those exact PNP 2N5087 trannies have been in two V2 Muffs I have owned, so I don't think they are super rare. I'm guessing E-H used them only when they could not get a batch of NPNs.
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