[morzh]

House GND is the Earth GND.
A waterpipe is a good one.

Or the GND pin in the power outlet.

[Jay Thomas]

Earth ground is best. Shouldn't blow gfi or breaker unless the cap that from the ac line to the chassis is bad.
Terry

Thanks Terry.

[Jay Thomas]

If you are interested in some changes I made to my 81 Jr to address the volume issue, check out the following thread.

http://philcoradio.com/phorum/showthread...2#pid38812

Bill

Thanks Bill.  May be the next thing I will try.  This seems to put the volume control in the output circuit where later models have them. 

Jay

Hi Bill:

I made the changes in your diagram to my delight!  Grounding the receiver was not an option for me.  With the circuitry change I can now control the volume from zero to loud on the strongest stations.  I do not notice any distortion at any volume level and I now receive more stations than I did before the changes.  Amazing!  Thanks much!

Jay

[Radioroslyn]

If you would like to raise the sensitivity that 1.2k resistor seem a bit low unless you have a 50,000w AM blowtorch near. The original was 20k. I'd play with that value. Try  5,10,15K. If you live in stickville you can just remove that resistor.
Terry