[Amps] Re: Amps Digest, Vol 15, Issue 10

[K3vw at aol.com]

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