[Elecraft] Tube Linear Amp design for basic K2

[Wyn]

Chas,

Thanks for your comments. It's interesting to see that someone else has come 
to some very similar fairly similar basic conclusions as oneself.

I have emailed RF Parts for the current price of the 4-1000a. At this stage, 
it may remain a drwing board exercise..

73s,
Wyn


----- Original Message ----- 
From: "Charles Greene" <crgreene at cox.net>
To: "Wyn" <vr2ax at attglobal.net>; <elecraft at mailman.qth.net>
Sent: Saturday, June 10, 2006 3:46 AM
Subject: Re: [Elecraft] Tube Linear Amp design for basic K2


> Wyn,
>
....   A 4-1000A is the nearest new(er) design tube.  I
> thought about how I could make the old guy put out something exciting when 
> driven by my K2.  I could swamp the input with a 200 ohm resistor and use 
> a 4:1 balun and the impedance to the K2 would still be 50 ohms.  ...... 
> The tube itself does not take any power in class AB1, but the input 
> voltage needs to be so much for a given output.  A 4:1 balun would 
> increase the drive voltage by a factor of 4 times which would increase the 
> output of the amp to 1600 watts if the drive remained the same, 800 watts 
> with 10 watts drive......  From 20 watts to 1600 watts is a power gain of 
> 19 dB which in my opinion is a little high.  I would be more comfortable 
> with a power gain of 16 dB, but you can try it.
>
>.......  Those tubes are expensive.
>
> 73,  Chas W1CG