[Kevin Kuehn]

Don't have an isolation transformer for color CRT. I know I could rig something up, but I jumped to the next step.

Tried measuring inter-electrode capacitance but was not getting clear eye openings on red and green.

Next tried the Sprague insulation resistance test between cathode and grids -

Red gun: 350-400 meg between cathode and grid.
Green gun: Less than 150 meg between cathode and grid.
Blue gun: Infinity between cathode and grid.
Every other combination shows approaching infinity, so I'm convinced there's no significant heater to cathode leakage.

Measurements were with no heater voltage. I have a suspicion the leakage resistance will drop if I light the heater, but I guess that's beside the point now.

So this all coincides with what both my CRT testers are telling me. I suppose I'll try charging a 4.7uf cap to 600v(highest my Sprague will go) and see if it has any affect on the green reading.