[ARC5] PS Hum in BC-453-B (Was Converters for Q5-ers)

[David Stinson]

----- Original Message ----- 
From: "Leslie Smith" <vk2bcu at operamail.com>

>  One benefit from this:  My set has an intermittent fault.  I 
> reported
>  originally that I had to replace the 12K8.
>  Wrong.  I replaced the 12K8 and the intermittent disappeared. 
> Later
>  the same fault re-appeared.
>  After that I probed around the 12K8 valve socket (used 
> multimeter
>  probes).
>  The fault disappeared.   Now, the fault  appears more 
> regularly.
>  This means I'll be able to find it.  There is some good in 
> every bad.

Les:
Look for intermits in the structure of the variable cap itself.
I am beginning to see oxidation between elements of
the capacitor plate/spacer/contact stack itself.
Flex the cap shaft and stator structure with the eraser end of a 
pencil.