what circuit were these smallbear matched germaniums destined for?

[bakerlite]

So after years (4) of procrastinating i have this week started through my pedal builds!

Ea trem and 3 knob tonebder complete and very happy!!

i have in my pile of "to do" come accross a matched set of germaniums purchaswed frm small bear.

So i am trying to identify the circuit this pair of germaniums were destined for?
one marked - 2N404a  A838   and the other marked 2n1305   550

also they are tied to a label that gives the following circuit details and is headed "Bear Face"

R2  11639k
R3 150K
R4 470r
R5 39k
R6 1k
R7 Jumpered
r12 jumpered


it seems this info does not correspond to the current small bear  'bear face' build.

does anyone kniow the old small bear 'bear face ' circuit or more importantly the circuit in which the resistors above refer too?

sorry for confusing post it was hard to write clearly!

[petemoore]

  The operative word is "Face".
  The Bear face contains a fuzzface IIRC, look closely at the schematic and see if you can find the 100k feedback loop resistor in the middle of a 2 transistor amplifier [Q1B and Q2C are connected in a FF].
  And the best place to put them is probably in a Fuzz face.
  Or if they 'fit'...
  See GEO how to choose transistors for germanium effects [something like that, it's in the Technology of the fuzzface article anyway, a must read if you want Ge FF or TB.
  The TB is a FF after a preboost stage. This makes it 1 transistor away from 'tonebender territory'...boost the FF input and there's a 3 transistor fuzzface/tonebender type effect.
  Trimpot Q2...I go through this every time.
  Socket the transistors, use the input/output cap wires as a place to splice in a 'reduction cap' [two series capacitors = reduced value]...starting large with those caps and the 100k as say 150k, piggybacking or seriesing is pretty easy and helps fine tune it.
  The trimpot for Q2 can be trimpot + stop ersistor:
  5k6/10kL trimpot allows Q2Collector R to be adjusted smoothly between 5k6 and 10k6, accomodating for adjusting bias on good Ge transistors.

[bakerlite]

cheers Pete much appreciated

while I find your replies a tad complicated or above my head there is just about enough there to get me on the right path thankyou.

I would like to build the current bear face on the smallbear site which does make use of 2 germaniums like these so i just have to learn how to 'see' the fuzzface part of the schematic in the context of the new version.

i might even email and see if i cant get a hold of his old bear face schem just to make sure i identify the correct resistors.

thanks again

[chi_boy]

Maybe you could ask Steve to take a look at this thread.  He frequently drops by and is always helpful. 

[Govmnt_Lacky]

R2  11639k

Either a typo.... or a VERY LARGE resistor!!!

[bakerlite]

for sure!

the smallbear germaniums designated for particular circuits shipped in a bag stapled to which is the resistor sheet - this sheet is like a grease proof paper
must be tricky to write on - i figure the 1 1 is merely trying to get the pen to get ink out but the confusing thing then is the value - 639k?
still if i am able to dig up the old bear face schem - it will all make sense.

its hard to find though especially as the site moved servers since the 4 years ago i bought them!

[LucifersTrip]

for sure!

the smallbear germaniums designated for particular circuits shipped in a bag stapled to which is the resistor sheet - this sheet is like a grease proof paper
must be tricky to write on - i figure the 1 1 is merely trying to get the pen to get ink out but the confusing thing then is the value - 639k?
still if i am able to dig up the old bear face schem - it will all make sense.

I've built a few fuzzes with 10M resistors, so 11M didn't seem too far out...here's one
http://www.luciferstrip.com/fuzz/orpheum.jpg

[smallbearelec]

The current BF schem is in here:

http://www.smallbearelec.com/Projects/BearFace/BearFace.htm

With the 2N404A as Q1 and the 2N1305 as Q2 try:

R3 (Q1 Collector load) 39K
R4 (Part of Q2 load)  470 ohms
R5 (Q1 Collector load) 11K This is a guess, but should be close
R6 (Feedback) 150K

Do this on a breadboard and tweak if necessary get about - 4.5 volts on Q2 collector

Regards
SD

[LucifersTrip]

The current BF schem is in here:

http://www.smallbearelec.com/Projects/BearFace/BearFace.htm

With the 2N404A as Q1 and the 2N1305 as Q2 try:

R3 (Q1 Collector load) 39K
R4 (Part of Q2 load)  470 ohms
R5 (Q1 Collector load) 11K This is a guess, but should be close
R6 (Feedback) 150K

The OP stated that he did indeed see this current schem but the values he had did not jive.  He asked what they were ORIGINALLY intended for...

[smallbearelec]

He asked what they were ORIGINALLY intended for...

Got the program now. I actually did find that schem in my files. Will reply privately to the OP because the early design has a lot of things in it that I would not do knowing what I know now.

SD

[Earthscum]

lol, I was reading it as 11.689k, not 11.689M. I was confused because that didn't seem so far off to me. I wonder if it was just a typo (I've done it, wouldn't doubt that anyone else has too).