[Amps] Super Cathode Driven Tetrodes

[donroden at hiwaay.net]

Roger Miller or Glen Miller ?

:-)

Don W4DNR


Quoting Ron Youvan <ka4inm at gmail.com>:

> On 10/28/18 20:40, Fuqua, William wrote:
>
>     Now that this discussion has gone on for some time, and everyone  
> has had a opportunity to read various articles, here is the question.
>
> Can anyone give me a reason why a cathode driven tetrode with the  
> control grid connected directly to
>
> the cathode be unstable. The screen grid is connected directly to  
> ground. Lot mu grounded grid configuration.
>
>> Sorry for typo error. Low mu.
>
>> There should be no reason for this configuration be any less stable  
>> that the usual high-mu triode grounded grid
>
>> amplifier, if fact should be more stable due to lower gain.
>
>
>   I am not experienced with such non-normal tetrode usage, but it occurs
> to me that the screen grid (being much closer to plate) being misused in
> this way can have greater gain than the control grid in many tubes, like
> the suppressor grid in the 6AS6 pentode has more gain than the control
> grid.  If so, the miller effect would be much greater.
> -- 
>   Ron  KA4INM - Youvan's corollary:
>                 Every action results in unwanted side effects.
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