[BC] Te st your wits on this

[Cowboy]

On Friday 24 February 2012 10:27:45 am Milton Holladay wrote:
> Two possibilities come to mind:
> !]  the drive circuit was damaged incidentally when the filament contact burned up and is causing some sort of spurious emission
> 2]  there was something simple yet subtle done wrong in the assembly of the filament contact which causes something spurious.
> Is there any outside possibility that the burned contact was a result rather than a cause ? 

 This is exactly the direction I'd have gone to start.

 It worked before.
 Something was done.
 It doesn't work after.

 Look real hard at the something that was done.
 All else is irrelevant.


-- 
Cowboy