[NostalgiaRadioTime]

Update:  Just to eliminate the possibility of a bad tube socket, I gator wired in a new 8 pin socket to the pin connections of first the 6J5, then the 6A8, and tried the set with the tube in the new socket outside of the chassis (scary, but I made sure nothing was touching where it shouldn't be). In each case, it made no difference to the reception. It's as if the OSC coil, while it tests good, isn't working or something is fighting it keeping it from working. But why would it suddenly just quit working from simply trying a different 6J5 tube.