> 3) The screen material and coatings is different in the 4CX- designs,
> and causes more secondaries when struck by primaries from the main
> beam.
As a gross generalisation, I reckon that well used 4CX250s have higher reverse
screen current and more flashover problems. I can imagine that tiny amounts
of cathode material might disperse over time and contribute to the effect -
does the same happen with the filament coating on directly heated tubes?
Steve
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|