Re: Pye CTM4.
This evening the chassis was reinstalled into the cabinet.
The scan coils refitted on the tube neck, the ion trap positioned in line with CRT base pin 3, the link between CRT heater pins 1 and 12 removed.
The set is ready for testing.
The attachment shows the results. Even with only 10KV the picture is quite bright. The height control has no effect on the picture, turns out the coupling capacitor between the frame oscillator and the grid of the PL82 output valve needs rewiring so that the height control is in series with the capacitor. No frame sync will almost certainly be the miniature selenium interlace diodes having gone high forward resistance.
No line sync because the reference pulses to the flywheel discriminator are absent.
DFWB.
|