[Amps] Super Cathode Driven Tetrodes

[Carl]

Tokyo High Power did it for decades with a pair of 4CX150A/4CX250B and 
stable as a rock on all bands.

As with many amps a homebrew version may not have the best layout and 
construction practices and the blame is put on the circuit instead!

Following an old W6SAI article in CQ I built one with a 4-1000A in the 70's 
and it was fine thru 10M using a B$W output network.

Carl



----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: "Amplifier Reflector" <amps at contesting.com>
Sent: Friday, October 19, 2018 3:06 AM
Subject: [Amps] Super Cathode Driven Tetrodes


>  Someone had posted that Super Cathode Driven amplifiers are unstable.
>
> Can someone elaborate on that notion?
>
>
> It does not make since due to lower gain and that screen grid is directly 
> connected to ground.
>
> I hope in the future to do some experimentation on this design. Goal is 
> one 4CX300Y driving 3ea
>
> for legal limit. Neat thing is that just about all the tx, driver power 
> finds its way to the output.
>
> This tube has 400Watts plate dissipation.
>
> 73
>
> Bill wa4lav
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
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