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The positive triode rectifier switch has the upper electrode as a cathode, the lower electrode as an anode, and the p-type semiconductor layer.
Circumstances changed dramatically in about 1925 when the new microphones and triode valve amplifiers introduced a few years earlier for radio broadcasting came into use.
The triode rectifier switch is simpler in the manufacturing process and lower in cost than a thin film transistor.
To prevent tube microphonics, the peanut-size triode is surrounded in foam and shock-mounted in a brass block.
Vinyl records and valve amplifiers are for them, with the triode valve being the one most favoured.
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