[R-390] R-390 "deadly components"

[Flowertime01 at wmconnect.com]

Brad,

The R390 is the good receiver.
The R390/A is the cheep knock off model.

The R390 has none of the problems like the R390/A.

Having said that, 
Check the tubes.
Check the 47 OHM resistors in the Audio and power supply deck.
Check the power supply filter caps in the audio deck.

You will not run into a problem until you run a tube to death.
The tube that dies will likely take a resistor or more with it.

Pull your decks out, do a good visual check to ensure you are not
running with a burnt resistor from some past event. Check all the tubes in 
a tube tester for shorts. And put every thing back together. Turn the 
receiver on and
enjoy.

Twice a year, check all the tubes in the tester.
Put the tubes back in the same socket they come out of,
Or you will need to do an electrical alignment.

Signal to noise and super receivers are another topic.

Roger KC6TRU