Date: Thu, 6 Feb 2020 22:48:39 +0000
From: Steve Thompson <g8gsq72@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] 3CX-3000A7 at 144
<GS35B, 8877 and the like have separate cathode - they don't need a
<CT for the B- return. DC switcher supplies work just fine as long
<as they go into constant current rather than tripping out on overload.
<Steve G8GSQ
## Points well taken. The GS35B has its cathode internally bonded to
one side of the filament.
So a separate, single winding choke is used for the DC return. Just
dont let the B- ever go open
on you.
## Moot point in the case of a 3CX-3000A7 triode. A fil xfmr with a
CT is readily available, simple setup.
A 7.5 vdc @ 50A switcher is no easy feat.....esp with the major
issues of inrush. Then toss in RFI from the switcher,
and the xfmr + CT looks even more appealing.
Jim VE7RF
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