[Amps] Super Cathode Driven Tetrodes

[Boye Christensen]

Hi

Can't any reason to drive a tetrode from catode !

How to control G2 voltage ?

This will act as modulation of G1 + G2

G2 voltage has a big infunce on PWR out of a tetrode !

Most companies using tetrodes will use g1 input

and  a g2 stable voltage  to catode !

73 Boye

On 29/10/2018 20:34, donroden at hiwaay.net wrote:
> 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.
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps


---
Denne e-mail blev kontrolleret for virusser af Avast antivirussoftware.
https://www.avast.com/antivirus