You really need to check before connecting a power supply. My Tecsun PL600 
charger shows positive on the outside shell. Who ever dreamed that one up?!

73
Jay K3BH

On Sat, Jun 27, 2020, at 20:08, Jim Brown wrote:
> On 6/27/2020 2:22 PM, hawley, charles j jr wrote:
> > Measure which wire goes to the outside shell of the connector, that’s 
> > ground.
> 
> Not always -- I have at least one consumer product and one piece of pro 
> test gear that has V+ to the outside of the connector.
> 
> 73, Jim K9YC
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