[AMRadio] 4-1000A Tube question

[jon baker]

     Paul,
   The gain of your amp. seems about right.
   I think the 4-1000A needs 120W.in for full output when
  used in G.G. Most "riceboxes" won't drive it fully.
     Jon


--- On Sun, 2/26/12, Paul Baldock <paul at paulbaldock.com> wrote:

> From: Paul Baldock <paul at paulbaldock.com>
> Subject: [AMRadio] 4-1000A Tube question
> To: amradio at mailman.qth.net
> Date: Sunday, February 26, 2012, 6:34 PM
> I'm getting close to the completion
> of a 4-1000A grounded grid amplifier.
> 
> The plate voltage is 4KV. I'm running  zero bias
> voltage. The no 
> signal standing plate current is 60mA.
> 
> One unusual thing I am doing is instead of a center tapped
> filament 
> transformer  I have two 10 Ohm resistors in series
> across the 
> transformer "simulating" a center tap. This means there is 5
> Ohms in 
> series with the DC to the cathode. So at 60mA this will in
> fact add 
> -.3V to the zero bias.
> 
>   The Eimac Newsletter FCJ-59D2 says at 4KV in grounded
> grid the 
> standing current is typically 120mA. Is my 60mA an
> indication of a 
> low emission tube ?
> 
> I do get a little over 10dB gain with 100W in and about
> 1200W out (75 
> meters). The tube is of course an old, quite brown,
> commercial pull.
> 
> Thanks
> 
> - Paul
> 
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