* Averaged over any audio-frequency cycle of sine-wave form.

S Grid voltages are given with respect to the mid-point of filament operated on a.c. If d.c. is used, each stated value of grid voltage should be decreased by 7 volts and the circuit returns made to the negative end of the filament.

t At crest of audio-frequency cycle with modulation factor of 1.0.

tt Modulation essentially negative may be used if the positive peak of the audio-frequency envelope does not exceed 115% of the carrier conditions.

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