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Re: [Amps] Initial RF testing of 4CX1000A amplifier

To: "Vic K2VCO" <k2vco.vic@gmail.com>, <amps@contesting.com>
Subject: Re: [Amps] Initial RF testing of 4CX1000A amplifier
From: "Carl" <km1h@jeremy.mv.com>
Date: Tue, 5 Nov 2013 15:34:31 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
That screen bleed goes back to the 50's or so when tetrodes were more popular than triodes.

Carl
KM1H


----- Original Message ----- From: "Vic K2VCO" <k2vco.vic@gmail.com>
To: <amps@contesting.com>
Sent: Tuesday, November 05, 2013 11:34 AM
Subject: Re: [Amps] Initial RF testing of 4CX1000A amplifier


My meter reads -10 - 0 - 40. Actually it is a normal meter with a new scale. There is a 10 mA bleed which brings the pointer to zero when there is no screen current. Very clever idea by GM3SEK.

I'll be testing with full drive soon.

On 11/5/2013 8:23 AM, Bill Turner wrote:
ORIGINAL MESSAGE:          (may be snipped)

On Mon, 04 Nov 2013 21:40:48 -0800, K2VCO wrote:

I am not sure the large negative screen current is normal with these
   conditions. What do you folks think?

REPLY:

Negative screen current is normal under conditions of low drive. At full
power it should be positive.

I highly recommend a zero-center meter for screen current.

73, Bill W6WRT


--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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