[ARC5] PS Hum in BC-453-B (solved!)

[Kenneth G. Gordon]

On 30 Jan 2015 at 15:25, Roy Morgan wrote:

> 
> On Jan 30, 2015, at 10:44 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:
> 
> > The OP is still very much in the conversation which is still about hum in the
> > audio output....The hum I have is not a real problem but it is still there and
> > so I have pointed it out. Possibly a small amount (it *IS* small) is being
> > picked up on my (external) wiring. It won't be hard to determine. Caps and
> > twists - enter stage left.
> 
> An interesting test to find where the slight hum is in the system would be to
> short the audio tube grid to ground

With as short a jumper as it is possible to make...

> while listening carefully.

Yes!

Ken W7EKB