>
>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?
The anode cooler is so large that it cools ok on ssb with a 1700 rpm
blower instead of the usual 3400rpm blower. . This makes much less
noise. // The anode cooler is a straight through design that makes much
less noise than the 8169 and 8281 coolers. // It is not short on peak
emission. // It can be had for not much money. // It is fairly
durable. // It can be rebuilt. // It can be operated in ultra linear
Class A at 1500w out.
>----- 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
>>
>>
>> --
>> FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>>
>>
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
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>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
--
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