Testing audio transistor out of Kenwood Trio TK 400 (TW-80D)

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there are two different types of transistor - NPN and PNP. The circuits for the two are similar, however the polarity of the power supply for PNP types is the opposite way around to that for NPN types. With NPN types the emitter is negative, whereas with PNP types it is positive.

schematics for pnp and npn transistors @ https://goo.gl/1Ywe52

This diagram shows the same common-emitter amplifier circuit using an NPN transistor (a) and a PNP transistor (b). The polarity of the battery and electrolytic capacitors are reversed, but otherwise the circuits are identical.

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Видео Testing audio transistor out of Kenwood Trio TK 400 (TW-80D) канала fixitdaz