[Amps] Initial RF testing of 4CX1000A amplifier

[Carl]

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 at gmail.com>
To: <amps at 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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