[AMPS] Iron regulated screen supply?

[rich]

>
>Contemplating building a tetrode linear from the accumulated treasures of
>years.
>Thinking back on the 30S-1 approach, and amateur as opposed to production
>budgeting.
>Thoughts:
>If one is starting from scratch with things accumulated from junk sales
>(with an aging ham population used equipment seems to be a buyer's market!)
>then a power supply made by stacking a frinstance 400V @ 1A peak with say
>3kV@ 1A  peak is not such a bad concept : 

//  An anode PS sourced shunt 400v screen regulator is cheaper, less 
complex, more RF immune, and more accident resistant than a 1A screen 
supply.  

>the screen load is trivial, one is
>basically making a slightly unorthodox anode supply.

Screen dissipation is not trivial.

>Again, tuned chokes are not such a big deal, and maybe plain choke input
>with a generous reservoir capacity and generous bleed current might show
>almost as good dynamic regulation. 

When an old timer [W6SDM] recommended againt such because of a transient 
regulation problem, I went home, fired up my DC oscilloscope and saw for 
myself.  When the load current decreased, there was a substantial 
V-spike.  When the load current increased, there was a substantial V dip. 
 On a meter, I could not see the problem.  

>After all tetrode high fi audio amps run
>low distortion (albeit with negative feedback) ...

//  Bingo

good luck, Barry

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


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