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[AMPS] Bargain basement broadband tetrode amp

To: <amps@contesting.com>
Subject: [AMPS] Bargain basement broadband tetrode amp
From: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Fri, 18 Aug 2000 20:50:51 +0100
Tom Rauch wrote:
>
>> The 4CX250B runs up to 400 volts on the screen.
>> 
>> I have run 2500 volts on the anode.
>> 
>> Runs very well with 2200Kv on plate, 350V on screen and grid between -60
>> to -80V.
>
>What is the zero signal idling current of the tube anode at those 
>voltages?

Too low. The plate and screen voltages are OK, but the grid bias is too
negative for the recommended ZSAC of 100mA... which is *another* thing
that's important for linearity.


73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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