[Penthode]

I tried clamping the 330 ohm 50 watt resistor to the selenium rectifier frame hooked up the 120 vac to it and waited. Ever 10 minutes she was really cookin'!

It touched 130 degrees Celsius which is 266 Fahrenheit. Getting better: better that the resistor with no heat sink and reaching 175 Celsius.

I am going to think about this. The answer is perhaps a different heatsink and fan which plugs in the octal socket or a minor redesign of the power supply to eliminate or at least minimize the huge voltage drop requiring this big resistor.