Philco 50-T702 7 Inch TV

[Electronic M]

IIRC increasing the capacitance (IIRC by about double) of the high voltage vertical coupling caps is a cure for vertical linearity issues in electrostatic sets. If the vertical stage ceramics you replaced are good and of the right value, try tacking them in parallel with the mylars and see if linearity improves any.

[reichsrundfu]

Originally Posted by Electronic M

IIRC increasing the capacitance (IIRC by about double) of the high voltage vertical coupling caps is a cure for vertical linearity issues in electrostatic sets. If the vertical stage ceramics you replaced are good and of the right value, try tacking them in parallel with the mylars and see if linearity improves any.

Well I tried increasing the capacitance as noted above to .01mF and no difference. The linearity is just horrible, either way. Heres a picture of a test pattern to give you an idea..........

-George-

[old_coot88]

Since the coupling caps didn't help, the still-squashed raster shows the vert sawtooth having a slow rise-time. I would consult the schematic to see what R or C values might be adjusted to give a faster rise time without changing the sweep frequency.