Si Fuzz Face: further biasing necessary?

[shredgd]

Hi,
I built a Si Fuzz Face some time ago and I never bothered to measure voltages at all the transistors pins, I just used a trimmer to get 4,5v at Q2's collector. Yesterday I measured:

Q1: c1.42  b0.62  e0

Q2: c4.54  b1.42  e0.78

instead of the suggested:
Q1: c0.5  b0.1  e0
Q2: c4.5  b0.5  e0.4

It seems I should raise the 33k resistor at Q1's collector (I read somewhere in previous posts that someone suggested a 100k).
As this involves raising resistor values, I can't do fast experiments by adding other values in parallel (as I usually do before doing fixed changes), so my question is:
should I bother and risk to "de-neat" my perf board work (which actually includes 2 other circuits: it is a 3 in 1 pedal...) or reaching those exact values is not important at all (tone-wise and electronic-wise)?
Thank you in advance,

Giulio

[B Tremblay]

Well, the most important question is "How does it sound?"

Those values are actually quite close to what I've measured on my Sili-Face and Sili-Face II.  My advice is not to worry about the values too much if it sounds good to you.

Also, those suggested values look more like a Germanium FF to me.  However, I could be wrong - it happened one other time.  :wink:

[petemoore]

What type did you use for Q1 in it?
 
 You can throw a FF together and have it sound good.
 You can put a FF together with some sockets and V/R's on perf, and tune to the best out of 200...saving breadboard space and allowing continuous FF tunings to be tried.
 I have a FF board all sockets and trims except a couple resistors.
 THen I have 3 FF's in boxes.
 A GE FF   "SoftHead"
 A Hybrid FF  "Actually a Rocket with Ge for Q2"
and a 2369 for Q1 Si FF.  "Face Cruncher"

[shredgd]

The pedal actually sounds good, but I've never played another fuzz face in my life, so I don't know if I'm missing something. However I think I won't change anything, I played it again today and I like it this way!
I'm using an old BC547 (I took it from an old TV) (gain of 145) as Q1 and a BC108 (gain of 300) as Q2.
Today I noticed I like the added bite I get by biasing Q2's collector at more than 4.5v (at the moment it is 5,4v).
Definitely a fascinating circuit, few components but broad possibilities.

[phillip]

The pedal actually sounds good, but I've never played another fuzz face in my life, so I don't know if I'm missing something. However I think I won't change anything, I played it again today and I like it this way!
I'm using an old BC547 (I took it from an old TV) (gain of 145) as Q1 and a BC108 (gain of 300) as Q2.
Today I noticed I like the added bite I get by biasing Q2's collector at more than 4.5v (at the moment it is 5,4v).
Definitely a fascinating circuit, few components but broad possibilities.

Like Brian said, if it sounds good, I wouldn't change a thing.

I also run my Silicon Fuzz Face circuits at a little over 5V on Q2's collector...seems to give the circuit some more balls

Phillip