B566a transistor cross reference8/7/2023 ![]() ![]() ![]() 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. Ic:-4A: (Ic/Ib):-N: 40W: F: 15MHz: Tmax:-the B566A is a silicon PNP transistor, Uce 60V, Ic 4A, applications: audio. 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. What I found in common on those fet ratings are the voltage, ampere, wattage and the ohms value. If you look original part numbers up in several vintage transistor cross-reference books (those printed in the 70s for instance) you are likely to come up with different subs from each book. They should be used only as a last choice if the original cannot be found. This is going to make repairing early solid-state equipment that used germanium transistors more and more difficult as the years go by. So-called substitute transistors may or may not work properly in the circuit without making adjustments to bias, etc. ![]() They can go bad with age, just like old wax paper and electrolytic caps do. Manufacturer Part Number(MPN): B566A Availability: In Stock Can ship immediately Price starting at US 3. You have to be really careful with "NOS" germanium transistors if that's what yours are. Transistor cross reference replacement and guide is very important for every engineers and technicians because the data that you found in this guide can help you to find the exact replacement for the components that you are looking for such as transistor, fet, ic, diode, zener diode and etc. ![]()
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