[Amps] Question for the tetrode experts

[Vic K2VCO]

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/