A Simple Clamp circuit for a Classic Tetrode Transmitter

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Steve - WB3HUZ:
G4DAF. The systems has rather poor IMD characteristics.


Quote from: k4kyv on January 08, 2008, 12:09:39 PM

I have a mid-50's vintage amateur radio slopbucket handbook published by CQ magazine.  It contains an article about "class-C"  linears.  It is basically a class-C amplifier with clamp tube, with careful attention to component values, connected in such a way that the clamp tube controls the PA plate current well enough to make it function as a linear.  The author claimed he accidentally discovered it while converting a DX-100 to slopbucket, then found some articles by a ZL using the same basic idea.  There are a couple of circuits using 813's in the final.  According to the article, the amplifier is just as linear as a class-B amplifier.

KD6VXI:
Quote from: Steve - WB3HUZ on January 08, 2008, 02:26:14 PM

G4DAF. The systems has rather poor IMD characteristics.

I thought it was the G2DAF...  Same thing your talking about, or was their another G series amateur making crazy amps?

And the DAF I thought was one that actually derived it's screen voltage from the drive signal?


--Shane

Steve - WB3HUZ:
2, 4 what's the difference? ;D  Yea, I know, 2!

I think we're thinking/talking about the same thing.

WA1GFZ:
Hey Huz, How did you get your dog to look so smart in that picture?

Steve - WB3HUZ:
That's the way she looks - smarter than her owner.

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