>
>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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