Dear John,
1. If you have the room, wind a new choke with heavier wire and long
enough to move the self-resonances to a benign spot.
2. Use the B&W, but add an additional choke that switches in
on 24MHz with the use of a vacuum relay similar to a Jennings RB-2A.
'73,
Hal
W4HBM
> I have a HB 4-1000A amp, covering 80-10, which I built in 1969 from
> a design in the Radio Handbook. I only have a Xerox of the article, so
> I'm not sure which edition of the handbook it was in. The title of the
> article is "The Utility 2 Kilowatt PEP (U-2) Linear Amplifier".
>
> I want to put this amp on the WARC bands, but I've heard that the
> B&W 800 plate choke is self-resonant somewhere close to 12M, and is
> likely to go up in smoke if I try to tune-up on that band. Is this
true? If
> so, what solutions have been found to be effective? Thanks!
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