[Amps] Grid Vs cathode drive

[R L Measures]

On Aug 2, 2006, at 11:40 PM, Hsu wrote:

> Hi,Guys,
>   Why many Amplifiers using cathode driven?why not grid ?

On the negative side, grid-driven tetrodes and pentodes require a  
screen supply, preferably regulated.  On the plus side, a grid-driven  
tetrode or pentode provides about 6x more power outout per drive watt  
than g-g.

>   it with only one advantage of cathode drive: it  seems more
>  stable than grid drive.but it needs Pi input network and more
>  driving power.The amp with grid drive  almost needs not driving power
>  and input network,it means we can let the fianl work in Class A,  
> the better IMD per formance,
> or we can drive the amplifier using a QRP rig?
>      73! Hsu
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org