>Hey anyone have any links to 4-1000 schematics? I'm looking for a
>swamped grid drive version with about 6.5KV on the plate. '73 KI4Z
>
The output circuit is the usual. The unusual part of this configuration
is the 200-ohm grid-swamping arrangement using a 4 to 1 bifilar step-up
transformer and the neutralization bridge. Such a circuit appears on my
Web site. . You are going to need 1000v on the screen in order to
realize the emissive capability of the 4-1000A's cathode. A circuit for
a screen reg. is on on the Web site. . If I was building an AB1 four
by one, I would ground both screen pins to the chassis, and float the CT
of the fil. trans. The screen supply connects between the CT (-) and
chassis-gnd. (+) This is the usual technique on larger tetrodes.
- later
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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