> If they're glowing you have an leaky soldering iron.
> Or some other source of stray current.

A major source of problems in some cases.
Try measuring between iron tip and a remote ground with a high 
impedance meter/scope. Then add eg 10 meg and 1 meg loads and see how 
much the voltage decreases by. The open circuit voltage is what high 
impedance devices will see!


        RM

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