[Username1]

If'n yer wanting to experiment on that Barkhausen thing..... I have 2 of the same model set
and they both have OEM Horizontal output tubes still in them, and they both have an ion
trap on them about midpoint on the tube. I got the Sams for the set, and they have the ion trap
on from the factory, and an explination as to why the trap is there.... and yes they
say it's the "B" Barkhausen.

So If you want to, get a small magnet, hold it so you don't get a shock, like tir it to a
wood stick, and move it near the side of the tube and see what happens....

But if it's the tube that the set calls for, and it's a good one, it's possible the problem
is something else.... Like your mini aurora show..... I have found the best thing
to do for that is to clean everything near it with windex, then let it dry for a few days.
And for the slug in plastic coils, chapstick is the best plastic safe lube to use.... It don't
take much, apply with Q-tip inside the coil, then wind the slug in..... Good Luck....

On the other thing.... You should check voltages on the Horizontal output tube, before
and after the shift in current. Do any of them change, even a little... That may be a clue...
Remember bias on G1 to a good degree dictates cathode current..... Is it runaway or not....?
Good thing to look into that screen grid cap as mentioned too....


.