[AMPS] Shunt regulated high voltage psu

[rich]

>
>At 11:04 PM 1/30/2002 +0000, you wrote:
>
>>Jim Strohm wrote:
>>>Another concern is -- there's been a lot of "put up or shut up" 
>>>catcalling, but the people calling the loudest really haven't provided 
>>>any hard documentation on their "facts,"
>>
>>I apologise to the group for my contribution to this "catcalling". However 
>>severe the provocation, I should not have risen to it.
>
>Ian,
>
>You - of all people - do not need to apologize. The provocation was severe. 
>Rich has become such a pain in the arse that I've finally filtered all his 
>posts. If he ever has anything useful to say again, I'll never see it.  Not 
>much risk there, is there ! 

"The lady doeth protest too much methinks."  (*Hamlet*, Act VIII)

>It is a shame that someone so capable of 
>contributing, instead does the opposite. A nearly complete waste of a good 
>mind in my opinion. ...

The rub is the claim that simple zener shunt regulation of the screen 
causes IMD.   My experience has been that designing a _satisfactory_, 
zener shunt regulator that allows the tetrode to meet it's IMD specs.  
However, designing such a regulator is not as simple as it looks.  The 
stickiest wicket is the semi-realistic dissipation rating method.   
Dividing the manufacturer's dissipation rating by 3 seems to address the 
problem. 
-  The advantages of screen shunt-regulation are:
1.  Automatic-sinking of potentially-fatal reverse screen current.
2.  Impossible to exceed screen dissipation rating if the source of V 
feeding the series-R to the shunt-regulator is >2x the screen V.  (as 
pointed out by Mr. Rauch)
3.  Immune to RF.
4.  Fail-safe.
5.  $implicity.
6.  The screen regulator can serve as the anode PS bleeder -- provided 
the HV filter is an oil-filled capacitor.

I used to killfile.  I pretty much gave it up - except for spam.  I like 
to read at least the first few sentences of every reply.  If it's of 
little interest, I click delete and start reading the next reply.  

cheers

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
end


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