2N1372's good for FF?

[aankrom]

I found a bag of 2N1372's in my basement. All I know is that they are PNP Ge. I heard someone once mention 2N1373's, but I only have 1 of those. I wondered about 2N274's since I have an insane number of those too.

aa

[petemoore]

  Pic 'n choose, they'll all sound different.
  Mainly the gain and Hfe matter.
  See GEO: Technology of the Fuzz Face
  Anyway, Build yourself a FF, with sockettted transistors and a trimpot instead of Q2 collector resistor [10k alone, or with 4k7 added... or 20k works good], swap till you drop...then test the devices 

[aankrom]

  Pic 'n choose, they'll all sound different.
...
  See GEO: Technology of the Fuzz Face

Yeah. Right after I posted that I checked out the GEO site and tested all my transistors for gain allowing for leakage. Pretty grim with gains around 16-20. But I found a couple of Sprague 2N2048's so I tested them too. These puppies were hot. One had a gain of 110 and the other was 200. Leakage wasn't bad at all either. I don't remember what I yanked these out of, they're pretty crusty. Could have been in my pile for 15-20 years. Definitely wasn't audio gear. I have torn up a lot of wicked scientific gear. They have the best parts, but Tektronix scope module parts are hard to identify, especially since a lot of them were custom. I have a nice pile of matched transistors, both JFET (sweet) and manic-depressive. But I ramble...

Finding high gain silicon is way way easier.

aa

[petemoore]

  Check out my 'Darlingtone Rangepig", I've darlingtonized a Ge with an Si as second Q....works good but the Ge I started with had gain of 55hfe IIRC.
  110hfe through 200hfe probably are good candidates for Q2 in FF, if the leakage is low.
  I'm getting great mileage from Easy Face, or something with Ge and Si in FF type circuit.
  It should be easy enough to get a stable usable FF to bias with some of the transistors you have and an SI in Q2.
  Results may very greatly depending on the amp or next stage used.