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BIPOLAR

A2

It does not stand for anything. It is a maker's designation mark, a throwback from the thermionic tube (valve) days. The letters in front of the number used to indicate the heater voltage and the type of internals (triode, pentode etc)

B used to indicate that it was a semiconductor, not a tube.

There are different designations around the world, for the same equivalent device, American, European and Japanese.

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12y ago

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