What to build with AC150

[Renegadrian]

I had the luck to get 3 Ge trannies (for 1 euro), AC150 - what can I build with them?! I think they are PNP but google doesn't find a lot...
Are they good for AC128 subs?!

[frequencycentral]

http://english.electronica-pt.com/db/cross-reference.php?ref=AC150

[Renegadrian]

yeah Rick, saw that, but got little clues about them anyway...

[trjones1]

As far as I can tell, any germanium is good for whatever circuit it sounds good in.  There's no telling until you try it out.  It's one of the reasons the fetishism over specific old trannies doesn't make sense to me.  I just built a Tonebender Mk II with random unsorted NPN germs I got off ebay and it sounds fierce, much better than my fuzz face which has the "right" transistors in the "right" gain ranges.

[petemoore]

  The 'ol FF testboard, sockets for transistors in 8pin IC [top two for measuring collector or whatever], also has another IC socket.
  The resistors start 'large' with long leg, though I find 33k is fine for Q1C, pots or other resistors across the resistors makes easy FF tune-jobs, wrapping one end around, shaping the 'switch end' of the resistors/switch so a quick iron touch 'n hold changes the value by bonding or lifting the parallel value of the piggyback resistor.
  Mostly looking for low noise in "the" lowish Hfe Q1, Q2's seemed easier to find, more of them worked so's I couldn't tell as easy, any of the medium Hfe's. Notes on biases, Quick Hfe' [I mean quick, in DMM] coupled with listening tests.
  Anyway, instead of trialing and tribulating over every FF transistor that comes along, in different boards each time...it's back to the 'ol testboard instead, it's ugliness makes the next FF neater.
  Oh, bias pot 'n stopR for Q2C [10kL, + 6k8], and whatever else might need altered.