i need help identifying some tranny's

[foxfire]

i have a couple texas inst. tranny's that i'm trying to identify but, i haven't been able to find any kind of a guide to decoding them. anybody know the code or where i should look?

[jayp5150]

Trannies, huh? I usually look for an abnormally large Adam's apple (kidding).

Texas Instruments has a cross reference thingy on their site. www.ti.com

That might help you.

[Papa_lazerous]

Got any pics mate? or at least the numbers or case style if they are NPN or PNP Si or Ge.

I have a load of House numbered Ge Texas instrument trannys its wholly possible you have something quite similar, I seem to be seeing allot of them lately

[foxfire]

i can do pictures if they are needed. they are in T0-39 cases and here is what they say,
1- R609 340
2- R609 410
3- 558550-2 345

i tried a search on that link but it couldn't come up with anything so i'll go back and try again, thanks, rlyan

[Papa_lazerous]

I take it there are Germaniums?  Got any idea what gain they have?  I had a look at what I have and they dont match up

[Sody54]

I realize this is an old topic, but I've come across some very similar components in an old Thomas organ.  There must be around 60 of these in there.  The organ itself isn't working, but I'm sure there are plenty of salvagable parts to be had.  Here's a pic of the tranny's on mine.  I'm assuming very similar to what foxfire has/had. 

Any ideas what they are?  I haven't dismantled anything yet.

[petemoore]

  Make a little socket for your HFe tester on your DMM, socket with three 'heavy duty' solid core leads, sticks deep in the Hfe meter, then you can test your short lead transistors.
  Careful getting them out, not to get too much heat 'in' them.
  Morgan likely they're PNP or NPN. Just flip 'em until a 'normal' reading appears, not the pinout.
  Sometimes pinout is 'suggested by looking at the board before pulling [ie if you have an NPN and one leg is Gnd., real good chance the next two leads are Base /Collector.
 

[kurtlives]

  Make a little socket for your HFe tester on your DMM, socket with three 'heavy duty' solid core leads, sticks deep in the Hfe meter, then you can test your short lead transistors.
  Careful getting them out, not to get too much heat 'in' them.
  Morgan likely they're PNP or NPN. Just flip 'em until a 'normal' reading appears, not the pinout.
  Sometimes pinout is 'suggested by looking at the board before pulling [ie if you have an NPN and one leg is Gnd., real good chance the next two leads are Base /Collector.
 

He wont get a accurate measure of their hFE with a DMM and germanium transistor though.

[Mark Hammer]

Lord only knows what it is now, but there used to be a kind of universal cross-reference for semiconductors that would let you cross-reference house numbers like the ones you listed (and boy do those look like house numbers!) with the actual categorical number for the equivalent part.  Not a substitutable functional equivalent, mind you, but what the house numbered part actually was underneath the black epoxy.  Great for folks who lacked the knowledge to recognize that a given CMOS chip with an MC or CD at the front or a U, UB, UBE, or AE at the end might very well be the same chip.  It was huge, written on onion-skin paper in very tiny print and really complicated to use (even though it was in a perverse numerical order), but it worked.  The last time I think I looked at one was some 20 years ago.  I would imagine that it has either gone digital (at considerable cost, although the paper version was quite pricey too), or awaits that process.

One source you can try is to consult with somebody in a university departmental tech shop.  I do not expect them to have the lastest version, but it is possible they might have a 1985-1990 version kicking around, which may well be good enough.