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I just finished recapping my 5S319. After turning it "on" the set went to operation right away with good reception even before alignment. Then the following started happening (before, during and after alignment): it would work good for some time, then the signal would fade away completely, then it comes back, over and over again.The longer I keep the set "on", the shorter the time between the fading. Fed the signal from my signal generator, and during the fading phase the only tube not letting the signal through was 6A8G.When I wiggle the tube and touch the grid the sound comes back after few moments. The voltages are: plate 200dc, pin#4 -200dc and pin #6- some crazy 800dc, and that is during the normal operation, but when it fades away the needle goes over 1000dc(?). Prior to that there was a break in the oscillator coil, I had to rewind it, but I think it would not work at all if I messed  it up. I do not have an extra tube laying around.
Does it sound like it is?  Thanks.

http://www.nostalgiaair.org/PagesByModel...001491.pdf