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Discussion in 'Amp Central Station' started by Bill Beck, Apr 12, 2003.
Why don't s.s. amps require input and output transformers?
Disclaimer: I am no amp Guru.
Transistor output stages have the capability to cunduct lots of current due to their low impedances. You can get just a couple of E - C ohms in a saturated transistor.
Tubes, on the other hand, have very little current capability due to their high plate resistance (1000's of ohms).
The OT in a tube amp makes the tube's plates 'look' like a low impedance source via it's primary to secondary impedance ratio, and enables it to deliver the current required to drive a speaker.