Re: [Amps] Super Cathode Driven Tetrodes

[Boye Christensen <oz7c@cool.dk>]

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@hiwaay.net wrote:
> Roger Miller or Glen Miller ?
>
> :-)
>
> Don W4DNR
>
>
> Quoting Ron Youvan <ka4inm@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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