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Re: [Amps] Grid Vs cathode drive

To: Hsu <Jbenson@sohu.co>, "Hsu" <Jbenson@sohu.com>
Subject: Re: [Amps] Grid Vs cathode drive
From: R L Measures <r@somis.org>
Date: Thu, 3 Aug 2006 07:25:39 -0700
List-post: <mailto:amps@contesting.com>
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@somis.org



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