[AMPS] What (modern) tube to use?

[Joe Subich, W8IK/4]

>
> €  Filament-current is a mere 75A.  Dahl makes a compact transformer.
> Tube handles are mighty nice.  8171s are typically a good buy in the
> surplus market.  They can be had for under 6-cents per watt.
>

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>



--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm