Montarbo Sinfhoton fuzz voltages?

LucifersTrip · July 05, 2011, 08:50:45 PM

I didn't get any answers on the other forum where someone posted this schematic...kind of a simplified Big Muff

I got a very average tone...definitely Muff-ish...nothing great, with 2 X 2N3904 (hfe ~ 200-225) and these voltage readings:
Q1 > ebc > 0, .18, 3.65
Q2 > ebc > 0, .60, 6.12

Does anyone know what they should be? Is this another 4.5-er?

I was just about to start swapping out different gains of transistors.

thanx

azrael · July 05, 2011, 09:18:55 PM

Yeah, I would aim for like 4.5V for optimal operation. Keep in mind that people may not have answered because no one owns one of those old fuzzes.

My response is just a guess, too.

LucifersTrip · July 05, 2011, 10:09:09 PM

Quote from: azrael on July 05, 2011, 09:18:55 PM
Yeah, I would aim for like 4.5V for optimal operation. Keep in mind that people may not have answered because no one owns one of those old fuzzes.
My response is just a guess, too.

there were actually people that had originals or clones who were posting on that thread...

4.5 is somewhat a guess since I have a bunch of fuzzes that are not even close to 4.5 when they sound the best,but I believe the Big Muff collector voltages are approx 4.5

John Lyons · July 05, 2011, 10:21:24 PM

Just a guess but I'd say anywhere from 3 to 5v is about right.
What are you getting now?
From what I remember while reading about this one, it's not as
saturated/fuzzy as a BM.

LucifersTrip · July 05, 2011, 10:58:42 PM

Quote from: John Lyons on July 05, 2011, 10:21:24 PM
Just a guess but I'd say anywhere from 3 to 5v is about right.
What are you getting now?
From what I remember while reading about this one, it's not as
saturated/fuzzy as a BM.

I'm getting a very average fuzz with some fat muffy-ness in there... what maybe could be described as a big muff with the fuzz knob turned half way.

I should get around to trying different gains/transistors soon and try to drop that 6.12 a bit

thanx

azrael · July 05, 2011, 11:12:25 PM

Well, but I don't think the guy who originally posted that it was right is he a regular...and DiscoFreq isn't a techy guy or a regular, either. Don't even get me started on mictester.

You have to be reasonable about it.

LucifersTrip · July 05, 2011, 11:25:26 PM

Quote from: azrael on July 05, 2011, 11:12:25 PM
Well, but I don't think the guy who originally posted that it was right is he a regular...and DiscoFreq isn't a techy guy or a regular, either. Don't even get me started on mictester.
You have to be reasonable about it.

the voltage readings are one of the easiest to take and one of the most basic requirements when diagnosing any circuit

azrael · July 05, 2011, 11:43:43 PM

You're right, but again, DiscoFreq is not a regular, and he runs a fairly big website. I don't really expect him to answer back in a timely manner....

LucifersTrip · July 05, 2011, 11:51:53 PM

Quote from: azrael on July 05, 2011, 11:43:43 PM
You're right, but again, DiscoFreq is not a regular, and he runs a fairly big website. I don't really expect him to answer back in a timely manner....

this conversation is kind of a waste...but two last notes:
-there were many people posting on that thread
-it was not necessary for anyone to even take actual measurements, just take an educated guess from past experiences

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Montarbo Sinfhoton fuzz voltages?