[Amps] Mounting Plate for a 3CX3000A7
chris at chriswilson.tv
Thu Jan 3 19:35:57 EST 2013
> ## 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
Jim, if the 3CX-3000A7 in my Henry RF generator I am converting turns
out to be a duffer, or fails prematurely (I have had filament power
and the blower on for a few hours, but not had the HV on the plate
yet), can I put in an F7 version? My pal has several brand new boxed
F7 versions, but no A7's. Thanks! Whilst I have your ear I have also
got from my pal a new Bird 10kW water cooled dummy load. I am about to
plumb it in in the attic where my shack is. I have the choice of
running 3/4" or 15 mm hard pipe from the house water riser to it. Will
15 mm copper flow enough? I won't be running the load at full whack :)
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