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

To: <donroden@hiwaay.net>, <amps@contesting.com>
Subject: Re: [Amps] Question about grid current in 4CX or 3CX
From: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 18 Mar 2019 09:19:36 +0100
List-post: <mailto:amps@contesting.com>
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@contesting.com] On Behalf Of
donroden@hiwaay.net
Sent: Freitag, 15. März 2019 16:38
To: amps@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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