Rich, why is the 8171 your favorite benchmark?? Seems to me that few of us
have/need/use a 10KW dissipation tube. Other than the handles... is there
some magic with this moose?
----- Original Message -----
From: measures <2@vc.net>
To: Ian White, G3SEK <G3SEK@ifwtech.demon.co.uk>; AMPS <amps@contesting.com>
Sent: Tuesday, March 28, 2000 6:46 PM
Subject: Re: [AMPS] 3/2 power law and Rich's very wide signal
>
> >
> >measures wrote:
> >>>Rise times on the order of 100 microseconds to 500 microseconds are
what
> >>>I've measured in the past.
> >>>
> >>Agreed. Do you feel that a typical screen bypass C can be fully
charged
> >>in 100uS in a DAF amp.? This is the real issue here.
> >
> >Or was that 2 milliseconds?
> >
> fair point, Ian. My guess is that 2mS would not be doable in a typical
> 8171 amplifier. So why try?. Holding the screen potential at the needed
> 1500v solves the distortion problem provided that grid-current is
> virtually zero. .
>
> >>My guess is that
> >>Mr. Thornley was not able - or was too lazy - to build a proper screen
> >>supply and bias supply .
> >>
> >
> >If Mr Thornley were still alive, you'd very quickly regret making that
> >cheap shot.
> >
> not a sound bet, Ian. Mr. Thornley did not construct a proper screen
> supply. He needs to explain why. // After reading the orig.
> article, my guess is that Thornley was not aware of why one needs to have
> constant screen potential applied Before RF arrives. // Eimac,
> Amperex, Philips, Svetlana and RCA recommend regulated screen potential
> for tetrodes in AB linear service Could they all be out of step except
> Mr. Thornley?
>
> cheers
>
> - Rich..., 805.386.3734, www.vcnet.com/measures.
> end
>
>
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