Date: Tue, 1 Jan 2013 23:45:20 +0000 (GMT)
From: DAVE WHITE <mausoptik@btinternet.com>
To: amps@contesting.com, Ed McKie <kb5gt@cableone.net>
Subject: Re: [Amps] Mounting Plate for a 3CX3000A7
I seem to remember getting one from RF Parts about 10-15 years ago.? I don't
know if they still stock them.? There was a separate grid ring and filament
filament assembly.? It's been in reliable service in my amp for over a decade
now.
HNY
Dave G0OIL
--- On Tue, 1/1/13, Ed McKie <kb5gt@cableone.net> wrote:
From: Ed McKie <kb5gt@cableone.net>
Subject: [Amps] Mounting Plate for a 3CX3000A7
To: amps@contesting.com
Date: Tuesday, 1 January, 2013, 0:36
Anyone know if a pre-drilled, pre-cut mounting plate for a 3CX3000A7 is
available?
Ed,? KB5GT
_______________________________________________
## The 3CX-3000A7 socket and mating grid ring is available from RF parts.
It’s identical to the one used in the Henry radio 8K ultra.
It was $275.00 in the mid 90’s. Last I saw, it’s now $375.00 That does
not include the chimney. Eimac doers NOT make a chimney for the 3CX-3000A7,
nor the 3CX-6000A7.
The way to get around the chimney problem is to build a wooden box around the
tube... with either a teflon or micarta top. The hole in the top is .005”
bigger diam than the OD of the tube.
## the socket sold by RF parts is a thing of beauty. It will handle100A CCS
of fil current easily. It uses a double row, one above the other of silver
soldered finger stock for the outer fil collet.
The inner consists of a hollow tube with a clip sitting in a recessed groove.
The 3x3 and 3x6 tubes use a coaxial fil assy. The grid ring is .125” thick
and 4.25” diam. Both grid ring and socket
are silver plated, then entire mess is silver plated. That socket is used
for both the 3CX-3000A7 and also the 3CX-6000A7.
## some will use the F7 version of the 3x3 tube..which uses 3 x flex leads.
2 for the fil and 1 for the grid. The grid lead is unbolted and tossed....and
replaced with the flange from a vac cap.
Then its just a case of bolting the flange to the chassis..and running the flex
leads for the fil over to the bifilar.
Jim VE7RF
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