[Amps] Re: matching network

[Ian White, G3SEK]

R. Measures wrote:
>
>
>>R. Measures wrote:
>>>>>**  Ian --  How does one convert this figure into a determination of
>>>>>how grid current divides between the grid and the screen during g-g
>>>>>operation?
>>>>
>>>>
>>>>Sorry, maybe what I said was misleading - I'm not sure if it's possible
>>>>to calculate Ig1/Ig2 in cathode-driven operation directly from mu-g1g2.
>>>>
>>>>They both result from the tube's internal tube construction, however,
>>>>which is why I believe that if one is high, the other will be too.
>>>>
>>>**  So if a tetrode with a g-/g2 amplification of 4 to 5 has c. 25% of
>>>total grid current flowing in the screen, a tube with a g/g2
>>>amplification of 13 might have c. 8% of the total grid-current flowing in
>>>the screen?
>>
>>Couldn't say... you'd have to do a point-by-point analysis using the
>>characteristic curves.
>>
>**  Ian --  The sticky wicket is that there are no characteristic curves
>for 0V on the  screen.

No *published* characteristic curves, for sure.

The manufacturers only publish characteristic curves for operating 
conditions that they can recommend. Outside of those recommendations, 
we're on our own.


-- 
73 from Ian G3SEK         'In Practice' columnist for RadCom (RSGB)
                            Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek