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[AMPS] What (modern) tube to use?

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Subject: [AMPS] What (modern) tube to use?
From: (Rich Measures)
Date: Fri, 19 Feb 1999 01:29:23 -0800

>> ?  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.  

?  Due to its 7" cooler, the blower requirements for the 8171 in amateur 
service are virtually  a piece of cake.   The chassis space is the same 
as for a 4-1000A/8166.  

>........ What do you
>think ... 9 KW with 7 KV on the anode and drive by a FT-1000 <G>?
?  As you like it.  .  With 2.5kVDC, c. 1.5kW.  .  The FT-1000 provides 
plenty of grid-drive.  


R. L. Measures, 805-386-3734, AG6K,  

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