Ed, look at the neutralizing capacitor at the base of the tube. It sounds as
you may have unintentially moved that little piece metal near the chimney
base, mounted on the hole cover. If you move that, it will cause parasitic
oscillations which will take out the plate choke, tube, or that little diode on
the
P/S near the edge of the board. I can not sit here and tell you how to adjust
it. It one of those things you have to know! Call Mike Ennis at Ameritrons
Service Dept. and talk to him about it. Check the cap at the base of the plate
choke to make sure that did not get wiped out also. The flash-over is going to
be
in the RF deck, most likely. One time I did have a short from the metal
supports for the capacitor board to ground, ( those metal supports are at
chassis
ground) and I had to adjust them. Some of the wires to that board that go
between the diode board and the capacitor board, are close to those support
post's.
Without looking at it, that is as far as I can trouble shoot on the
internet!! Willy K3VW
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