[klondike98]

I clipped in a 100pF cap across C9 but it had no effect and I added a 25K resistor across R2 also to no effect although that did raise the voltage on 6SA7 pin#4 to about 65 volts.  I did some additional checking to see if the oscillator transformer was shorting and did not seem to find anything wrong.  However I did find that the resistance to ground at the point where you see the RED dot in the schematic below was 485 ohms.  I could not see any reason that it should be that low unless one of the capacitors was leaking badly.  C25 (a 5pF) cap seems to be the culprit and when isolated I see 485 ohms across it.  Unfortunately I don't have a 5 pF cap to replace it so will have to order one to confirm whether this is the problem or not with the oscillator.  We'll have to wait and see....

[Image: https://www.dropbox.com/s/z3k4f96ea4pmxn....jpg?raw=1]