TRK12/120 Restoration

[dtvmcdonald]

I got a picture on the thing tonight.
The sweeps seem to still be OK. The cathode and
grid signals to the CRT seem reasonable ...
say +75 on the cathode and -5 to +25 to +50 on the grid.

However the CRT G2 and focus seems totally out of whack.
With those K and G1 voltages I get normal brightness but very very
bad focus. If I either increase the video drive or decrease the
cathode voltage ... making it excessively bright ... I get good
focus but its very unstable.

I set the resistor chain on the HV to the ratios given by the
schematic ... the set came with the G2 set way up the
chain from what the schematic says.


Does anybody with one of these radar tubes know what the
correct G2 and focus voltages are?

Doug McDonald