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Re: OK, all you hi-RPM propellerheads...........

Solid-state devices are often operated with local feedback, esp. output devices, most commonly as emitter-followers. We can do this with tubes, too, but the input swing required to drive a cathode-follower output stage is horrendous--far more demanding than a triode. McIntosh addressed this problem by means of a positive-feedback bootstrap driver. Unfortunately, a large part of the nonlinearity eliminated in the output stage is added back in by the driver stage. So linearizing a pentode by means of local feedback involves some trade-offs unless one can come up with a linear high-swing driver. That's what I've been working on lately.




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