[rfeenstra]

Keep us posted, Russ, on what you find. I, too, am working on a H500 with the same tube so I'm hoping all works well. I have also read about some of the problems with this tube. My radio (see November finds) was working an all bands before I disassembled to rebuild. The radio had been worked on previously. The selenium was bridged with a silicone diode with no extra resistor added. I assume the tubes were running a bit higher filament and operating voltage - probably not good for these somewhat fragile tubes.. I'll be interested in what you find.