[Amps] Question for the tetrode experts

[Carl]

So what is the Load cap?

Carl
KM1H


----- Original Message ----- 
From: "Vic K2VCO" <k2vco.vic at gmail.com>
To: "N1BUG" <paul at n1bug.com>
Cc: <amps at contesting.com>
Sent: Friday, November 08, 2013 4:09 PM
Subject: Re: [Amps] Question for the tetrode experts


>I have a vernier on it. Maybe I exaggerated -- it's not all that bad, just 
>different. It is smooth. I just need to get used to it. A plus: the screen 
>meter is very useful as a tuning indicator!
>
> On 11/8/2013 1:01 PM, N1BUG wrote:
>>> Tuning is VERY touchy. You really have to have the loading right or the 
>>> screen current is
>>> excessive in either direction.
>>
>> None of my 4CX1000A or 4CX1500B amps were all that touchy, from 1.8 to 
>> 144 MHz. Screen
>> current does vary with loading, from negative through zero to positive, 
>> but it is a smooth
>> and easily controlled change provided the loading capacitor has some 
>> reasonable rate of
>> adjustment. I prefer vacuum variables, but if using an air variable I put 
>> a vernier drive
>> on it.
>>
>> With vacuum variable tune and load caps in a pi network, I have no 
>> problem going from band
>> to band by using logged presets. Of course the presets have to be changed 
>> if I make any
>> change to the antenna system, and tuning needs to be verified if there is 
>> any possibility
>> of weather conditions affecting the antenna (ice or snow).
>>
>> 73,
>> Paul N1BUG
>
> -- 
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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