[R-390] Potting tar in power transformer

[Steve Hobensack]

  I just finished repairing my '63 Imperial. It was blowing the Mains fuse. 
I got a bad megger reading on the dual 120 volt windings. Seems the potting 
tar carbonized and shorted the power leads just inside the steel box. Five 
years ago this happened with the high tension winding. I never thought it 
would happen on the lower voltages. The repair is a little messy involving a 
heat gun but straight forward. Just run some good teflon wire through the 
porcelain bushings and don't use the attached solder lug. The power 
transformer was marked "Phoenix company". In a nutshell , don't trash your 
power transformer without first checking for insulation leakage.
..73..Steve..N8YE

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