Going one step further and looking that number up, shows possible replacements as: 2N2495, 2N3279, 2N3280, 81, 82, 83, and 84, PTC145, GE-51, TR-17, HEPG0008, SK3006, JR200, ECG160, WEP637, 276-2005.And to further complicate matters, if you look up some of those numbers, the subs for them are different. For instance, Sams Transistor Substitution Handbook 1978 shows both the 121-294 and 295 as being equal to the 2N2654. If you look original part numbers up in several vintage transistor cross-reference books (those printed in the 70's for instance) you are likely to come up with different subs from each book. This is going to make repairing early solid-state equipment that used germanium transistors more and more difficult as the years go by. The obvious parameters to satisfy are breakdown or max collector voltage, next is beta (hfe. Just like you can replace a bolt with a stronger bolt, your can replace a transistor with a stronger (better) part 99 of the time. So-called substitute transistors may or may not work properly in the circuit without making adjustments to bias, etc. Hi, Ive been working on my new T-582 and found a bad transistor on the vibrato circuit. They can go bad with age, just like old wax paper and electrolytic caps do. Sams Technical Publishing has added thousands of new semiconductors to the fifth edition of this book, the most comprehensive cross reference available for. Hammond T-582 Transistor cross reference. Check Datasheet for more information.You have to be really careful with "NOS" germanium transistors if that's what yours are.
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