Re: [Phono-L] Does anyone know how to make a Jones Motrola _safe_?

[Rich]

There is no practical way to make these old devices absolutely idiot 
proof safe. Grounding the chassis and polarizing the power plug will at 
least open the power source after you experience a current flow to 
ground. The 3rd prong ground system may very well be defective and not 
protect the user. These items rely on the user understanding the hazards 
and taking the appropriate protective actions. Back about 50 years ago 
there was much research on the consequences of passing 60Hz currents 
through the human body and the end result was that between 5mA ans 100mA 
had the highest probability of causing death. This just happens to fall 
in the range of the nominal shock current resulting from contact with 
common household wall plug potential of 110v-125v. The major source of 
this research compilation was Tektronics Co.

Those who served in the Navy may remember the training film "120 Volts, 
The Deadly Shipmate".


<Big SNIP>
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