[R-390] R-390/URR Completely dead!

[Roger Ruszkowski]

Jim,

We know the original line filters have internal caps that conduct enough, current to ground, to trip modern GFI devices. This current is also the source of many shocking experiences. 
Options are,
Replace it with another filter from a hanger queen (ask here on the reflector) or NOS.
Gut the one you have and wire it straight through
Re stuff the one you have with some smaller caps and bigger inductors.
Find a nice filter device from a switching power supply that accepts the new style computer cords and install it with a butch plate.
Re stuff the original case with the guts from one of these new style filters.

I think you have more problems than just the filter. It could be that a cap shorted and then opened a inductor in the filter. But I think you have a short further down the line. I am not surprised the fuse did not blow and you could expect a problem after the fuse.

Pull out the power supply and audio deck and check the 27 ohm resistors and the 6082 series regulator tubes.
Check the oil filled power supply caps in the main frame chassis. These two critters are located different than in the R390/A. The R390 depends on the series regulator tubes to filter the B+ ripple not so muchthe filter caps. If the caps are not shorted with a meter, or just plain rusted to the point of leaking, they are likely good.

Once you get the filter replaced. Un plug all the wire harness connectors. Get out your power cord with the in line fuse and make sure you have a small 2 amp fuse in the test fuse holder. You do not want to burn up a wire harness looking for a short.  Drag out the schematics to determine what order from power cord to speaker the connectors should be re connected in.
Do not unplug and re plug connectors with the power on. Be systematic in your procedures.

Not a big problem.

Roger AI4NI