small valves

[Dwight K. Elvey]

>From: ard at p850ug1.demon.co.uk
>
>One think to be wary about. There is a capacitor across the filament 
>string, after the capacitor. If the filament string is open-circuit for 
>any reason, then that capacitor will charge to about 90V. It normally 
>withstands that (although it's not rated to do so), but if you then 
>replair the filament strign, there's enough energy in that capacitor to 
>burn out one of the filaments. I always make sure that capacitor is 
>discharged before fiddling with the valves.

Hi
 Also a problem in the Zenith TO's.
 
>
>-tony
>