[Hallicrafters] AC Bypass Caps in SX-111 MK 1.

[Roy Morgan]

On Dec 13, 2010, at 1:03 AM, Glen Zook wrote:

> Actually, it really isn't leakage.  Capacitors are supposed to pass  
> AC and block DC.

Glen and all,

Right you are - the capacitor passes some AC current, some times  
enough to trip ground fault detector devices.

> Now when the capacitor does fail, then the full mains voltage and  
> current then can definitely be on the chassis.

I suggest that if you want bypassing, you use X and Y rated line  
bypass caps (justradios.com in Canada has them at reasonable prices,  
and their website gives bypass cap application information).

BUT, to avoid any trouble in the extremely remote possibility that one  
does fail, put an X cap from Line to Neutral and a Y cap from Neutral  
to chassis.  Then if either cap fails shorted the result will be a  
safe situation.

  Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!