[Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke

[David Kirkby]

Ian White G3SEK wrote:

> A thyristor is really the ultimate answer for screen protection. With a
>
>zener to trigger it, a thyristor can be made to fire very quickly, at 
>only a few percent higher than the normal screen voltage. Of course the 
>thyristor then switches into a low-voltage, high-current condition which 
>protects the screen very effectively.
>
Don't forget the thryatron - that will work at power levels that 
semiconductors would have no hope of coping with.



-- 
Dr. David Kirkby, 
G8WRB

Please check out http://www.g8wrb.org/ 
of if you live in Essex http://www.southminster-branch-line.org.uk/