[AMPS] Screen protection WHAAAATTTTTT!!!!

[measures]

>
> 
>> Tom I usely have an HT transformer and then a seperate transformer for
>> grid,screen and control (aux) voltages.I have started to get transformers
>> custom wound locally as I have found it quite cost effective.I still need
>> to get big HT caps from the US.How much will an 8kV 40 mfd HT cap cost me
>> surplus these days?(Winter project).
>
>22uF 4 kV caps are about $30 surplus here.
>
>You don't need a separate transformer for the system I described, if 
>you have a dump relay on the primary that activates with a fault. A 
>relay will be fast enough.
>
>The advantages are it fails safe and limits screen dissipation 
>instantly...without relying on any other devices.
>
>Screen dissipation is limited by the ESR of the source. As long as 
>the source voltage for the shunt regulator is twice the operating 
>screen voltage or higher, you can never overdissipate the screen.
>
>I use such systems all the time

(key words)

> in big tubes, like 4CX10000's and 
>larger, but it also works great in small PA's like 4CX250's.
>
Tom --  Shunt screen regulators work well with 4cx250s.  My guess is that 
you did not use a shunt regulator with a 4cx10,000D.  

end

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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