This morning I wrote:
"A female chassis connector would be installed on the PS, and a
recessed male chassis connector placed on the RF deck. With 8-pins, I can
double-up on 240V and ground wiring."
Just the opposite: 240VAC power to the PS cabinet is sourced from the RF
deck. That means the PS cabinet gets a chassis-mounted, recessed male
connector.
Some folks may wonder why I'll route AC power this way instead of connecting
AC first to the PS cabinet. The Alpha 77D chassis already has the
step-start and AC input circuitry. I see no need to move that over into the
PS cabinet. In essence, the 240V AC input power for the HV transformer
loops out of the RF deck and into the PS cabinet. HV DC is created by the
transformer secondary, diode stack and oil cap. The resulting B+ and B- gets
routed back into the RF deck by means of the SHV (B+) and Cinch connector
(B-).
I suppose a dual breaker could be added to the new PS cabinet for the new
Dahl HV transformer primary but that's already protected by the existing
fuse pair in the RF deck. Speaking of the panel fuses, Dick Byrd, N4UQ,
sells a "big fuse" upgrade for the big Alpha amps. Despite my best research
effort, I have not found those fuse-holders in the major industrial on-line
vendor catalogs. I see a Bussmann and Littelfuse line that jumps into some
big $$$ but that doesn’t seem right. Before I bug N4UQ, anyone know that
fuse-holder type?
Paul, W9AC
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