Pulse Duration Modulation?

[EWoodman]

Does anyone happen to have any info/schematics on PDM as it would apply to an
AM tube type transmitter?  I heard one on 160M the other day and it sounded
really nice. Unfortunately I wasn't able to get set up on 160 in time to ask
him about it.

I've been told the basics on it but would like some practical information. The
fact that it doesn't require a modulation transformer makes it quite
interesting.

Any help would be greatly appreciated.

Eric   KA1YRV

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