Hello, I have transistors with numbers on it that I can not identify. I am looking for as much information as I can find on them such as their uses, capacities, price, etc. The say Delco GM with the numbers 1702588_2 343 and they seem to come in pairs. Thank You

 

Pictures should be taken in daylight but not sun shining on the object. Make sure you get proper focus.

Have you tried to identify the terminales in each transistor of those "pairs"?

 

Those are in-house Delco proprietary numbers, and you unlikely to find any info on those devices.

 

Those transistors were ubiquitous in the factory installed radios in GM vehicles.
As such, it was in GM’s interest that any repair would be only done with “factory genuine” components. Thus they would hide the JEDEC number with a proprietary house number.

If I recall correctly, these were germanium transistors, and as such its performance characteristics were less than stellar.

 

Pictures should be taken in daylight but not sun shining on the object. Make sure you get proper focus.

Have you tried to identify the terminales in each transistor of those "pairs"?

I actually do not know how to " identify the terminales" as I really do not know what that is, but I would like to know how to do that.

 

2N174 Data sheet

 

Hi

I actually do not know how to " identify the terminales" as I really do not know what that is, but I would like to know how to do that.

Rather then trying to explain in text how to test a transistor using an DVM, I suggest you watch this youtube video that does a good job of explaing the process. FYI: Transistors have 3 terminals: Base, Collector, Emitter. The devices you show have 2 wire leads and the body of the component is the 3rd lead. The threaded terminal would imply that this is used in an output power stage of an, I assuming here, a radio's amplifier. I point this out becuase while you can determine the type of transistor using a DVM it won't tell you how much current it can handle - so, once you determine if it's an NPN or a PNP transistor try to find a general audio power transistor rated for high current handling.

Good luck!