814 like as triode?

814 like as triode?

Hi All:

Anyone knows the conditions of work of pentodo 814 like triode with
grid grounded ? (for a a RF linear amplifier )
Thanks in advance

Heriberto
LU6DBU

Re: 814 like as triode?



Heriberto wrote:
>
> Hi All:
>
> Anyone knows the conditions of work of pentodo 814 like triode with
> grid grounded ? (for a a RF linear amplifier )
> Thanks in advance
>
> Heriberto
> LU6DBU

814 data is at

* w w w .mif.pg.gda.pl/homepages/frank/sheets/049/8/814.pdf

The G2 voltage determines Ia as does bias Vdc on g1.

And g2 shouldn't be more than 400V.

So you'd have to be careful that the Ea for triode isn't too high
lest Pg2 exceed the 6.7 watts allowed.

814 has quite high Ea ratings, but these could not be used for triode.

Grounded grid would also mean the cathode input impedance would be low.

Ra will also be low, and affect the Q of the anode tank LC circuit.

But you do get triode linearity for class AB.

Patrick Turner.

Re: 814 like as triode?

Hi Patrick:-
Many Thanks for your help
Regards
Heriberto
"Patrick Turner" <info@turneraudio . com .au> escribió en el mensaje
news:47F6CE0A.E8E473A7@turneraudio . com .au...
>
>
> Heriberto wrote:
> >
> > Hi All:
> >
> > Anyone knows the conditions of work of pentodo 814 like triode with
> > grid grounded ? (for a a RF linear amplifier )
> > Thanks in advance
> >
> > Heriberto
> > LU6DBU
>
> 814 data is at
>
> * w w w .mif.pg.gda.pl/homepages/frank/sheets/049/8/814.pdf
>
> The G2 voltage determines Ia as does bias Vdc on g1.
>
> And g2 shouldn't be more than 400V.
>
> So you'd have to be careful that the Ea for triode isn't too high
> lest Pg2 exceed the 6.7 watts allowed.
>
> 814 has quite high Ea ratings, but these could not be used for triode.
>
> Grounded grid would also mean the cathode input impedance would be low.
>
> Ra will also be low, and affect the Q of the anode tank LC circuit.
>
> But you do get triode linearity for class AB.
>
> Patrick Turner.