On Nov 7, 2005, at 11:43 PM, Ian White G/GM3SEK wrote:
> Shawn Tayler wrote:
>>
>> I had totally missed that. The input circuits were right next to the
>> grid circuit and I had simply assumed. Well how about that. Hmmm,
>> very interesting. Kinda burst the bubble for me. I must be blind and
>> deaf.....
>>
> The problem is that everything about the 30S-1 is more weird than you
> think it's going to be.
Amen, Ian. However, the 30S-1 is the only amplifier that is apparently
parasite-free. This may have something to do with the fact that its a
G-G amplifier with Two RF-grounded grids shielding the input from the
output.
>
> It's a fascinating design, full of complexities caused by the decision
> to cathode-drive a tetrode. You have to wonder why they didn't use
> grid-driven, passive grid - or hadn't that been invented at the time?
Collins engineer Vern Baumgartner, W6HW, told me that Art Collins
wanted a SSB linear that would not be driven to more than 1000w by the
S-Line. A tetrode in AB1, cathode-driven was one solution.
>
> --
> 73 from Ian G/GM3SEK
> http://www.ifwtech.co.uk/g3sek
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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