[Amps] Question about grid current in 4CX or 3CX

Peter Voelpel dj7ww at t-online.de
Mon Mar 18 04:19:36 EDT 2019


Hi Don,

The grid dissipation of the 4CX10000D is 75W.
It takes 150W of drive for 250mA of grid current with that tube in class-c
with anode and screen voltage supplied.

Are you thinking of a different tube?

73
Peter


-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of
donroden at hiwaay.net
Sent: Freitag, 15. März 2019 16:38
To: amps at contesting.com
Subject: [Amps] Question about grid current in 4CX or 3CX


Question :


For the larger tubes with handles  ( commercial service )

Does grid current increase or decrease as plate voltage and screen  
voltage is removed. ?

If it takes 250 watts to produce 100ma of grid current in a 4CX10,000.
is the grid just a big dummy load and is it doing the tube harm to  
dump 250 watts into it when both plate and screen voltages are removed ?


Don W4DNR


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