F2 Power AmplifierThe F2 is a stereo power amplifier which offer 5 watts output. Like the F1, it is a current source, but it is different in several ways. The F1 operates in what I would call “balanced single-ended Class A” and the F2 operates as simple single-ended Class A. The output impedance of the F1 is 80 ohms, but I have provided the F2 with an output impedance of 15 ohms, based on the observation that no useful application of the F1 called for a higher figure. As a single-stage single-ended circuit the F2 has no use for balanced input connectors so it simply has RCA inputs, as seen here in this simplified schematic: The am is a bench made amp roughly based on the F2.
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