[AMPS] What (modern) tube to use?

[Phil T. (VE3OZZ)]

Joe, I've always been intrigued by the 3CX5000A7 and 3CX10,000B7 but Ive
yet to find a surplus one.  These require no socket (bolt directly to
chassis), and the heaters draw less current than a pair of 3-500Z's.  The
cathodes are oxide coated, indirectly heated (obviously), so warm up is
required.

Don't know anyone that's used one for an amateur amp but there must be
someone.

Phil T

At 06:26 PM 2/18/99 -0500, you wrote:

>
>OK ... I looked at my Varian catalog and the 103 Amps was for the "J"
>version of the 4CX5000/4CX1000.  Still, the requirements for filament
>power, air socket and air flow are a bit stiff for the amateur builder
>(and no amateur commercial builder is using the 8171).  What do you
>think ... 9 KW with 7 KV on the anode and drive by a FT-1000 <G>?
>
>73,
>   ... Joe Subich, W8IK/4  ex-AD8I
>       <W8IK@IBM.NET>
>
>
>
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