Series-Pass tubes - Class C Audio Modulation

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Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>

 >>> Could you recommend some tubes which would be available to use as
Series-Pass tubes???

Thanks

The Captain


A slightly better technique is series modulation where you leave the
oscillator in class-C but bring the supply voltage in through a series-pass
tube. By modulating the grid of that tube you make the B+ go up and down in
time with the audio. For maximum undistorted output, you make the quiescent
supply voltage half of what your power supply gives: 25% power again. If
you were regulating the power supply anyway, you could modulate the
regulator tube.

Steve C.