Salvaged GE transistors (kinda long)

[greenacarina]

I'll try to be as concise as I can. I'm sorting though my salvaged components and separating all my GE trannys. Most are marked but a few are mysterious. I'm sure there are good ones to use and not-so-good ones to use (for effect pedal purposes). First, the mystery guests-

The packaging on this one looks like "modern" trannys, but not quite. Is it anything special?


This one has so many numbers I didn't know what to call it-


And I thought these just looked cool-


Now, here's a list of what the others were marked-
RCA- CCR427
Matsushita- 2SB346
                  2SB348
                  2SA101
                  2SB172
                  2SB324
                  2SB175
                  2SA550
NEC- 2SD205
Mystery- K59 (has 4 leads!?!?)
             SE7056
             572
             T7046
Is any of this worthwhile, or do I have a box full of crap?
Thanks!
Chris

[Threefish]

I can't help with the identification of any of these, but WOOOOHOOOOO! You've GOT to do something with those ones with the fins. I know they're just cooling fins, but they're fins all the same  .
I've often thought about some of my pedals being more visual...but we're going off track.
I'm sure someone here can help you....

[zyxwyvu]

This might help you figure out which ones are useful:

http://www.smallbearelec.com/HowTos/FuzzFaceFAQ/FFFAQ.htm

Check the section titled "If I want to hunt for my own devices, what type numbers do I look for?"

[Sir H C]

Best transistors sites I know:

http://homepages.nildram.co.uk/~wylie/2Nseries/2Nseries.htm

http://semiconductormuseum.com/

http://users.arczip.com/rmcgarra2/

http://www.oldradioworld.de/transi2.htm

If these sites can't help, no clue. 

[petemoore]

  You can have your DMM look at the B/E diode drop, if it looks like the voltage drop of a Ge Diode then it looks like a Ge Diode in there...!
   + the Ge Transistor Checker...or just schtick that dude in a socket and see if/how it fires up your Ge position there [I use a FF and RM as Ge 'Testjigs', something with adjustable bias...]...once you find the pinout, DMM should help with that while telling you an Hfe in which Leakage throws off the reading.
  I have a FF with a 10k trimpot which has a stop resistor of 4k7, so that I can R Range the Q2 collector Resistance and adjust it between 4k7 and 14k7, much outside that range and I think a different transistor may bias better.

[zachomega]

I have a bunch of 2SB175's.  All of mine have a leakage of something like 50uA or less and a gain of approximately 70.  Good pick for something like a rangemaster.

-Zach Omega

[Dai H.]

the first one looks like a 2SC733 BL ( = BLue = gain grouping). Toshiba? An old one.

[Dragonfly]

I'll try to be as concise as I can. I'm sorting though my salvaged components and separating all my GE trannys. Most are marked but a few are mysterious. I'm sure there are good ones to use and not-so-good ones to use (for effect pedal purposes). First, the mystery guests-


Now, here's a list of what the others were marked-
RCA- CCR427
Matsushita- 2SB346
                  2SB348
                  2SA101
                  2SB172
                  2SB324
                  2SB175
                  2SA550
NEC- 2SD205
Mystery- K59 (has 4 leads!?!?)
             SE7056
             572
             T7046
Is any of this worthwhile, or do I have a box full of crap?
Thanks!
Chris

LOOK HERE for more info on those transistors...

AC

[Moonface]

2sc733 - si
2sb246 - ge
2sb248 - ge
2sa101 - ge
2sb172 - ge
2sb324 - ge
2sb175 - ge
2sa550 - si
2sd205 - si
se7056 - si

[Moonface]

http://www.datasheetarchive.com/ 

[jrc4558]

2SA and 2SB are PNP
2SC and 2SD are NPN
2SK - fets