An update to
this thread!
What an excellent end to thanksgiving day!
Since I had the last two days off, I decided to jump back into my capehart project. I installed the decent CRT I got from another member and put it back in the cabinet loosely. Corroded CRT base and socket pins were to blame for a dead heater condition at first.
Repeated HO Drive and ion trap adjustments helped the very dim picture.
Right now it runs, but still needs lots of work. Problems currently are:
1. Still a bit dim. If I play around with the AGC and fine tuning it improves slightly, but I suspect video troubles. CRT voltages are good, as is HV and CRT emission.
2. Vertical height lacking --but only slightly
3. horizontal sync extremely weak. It loves to pull and tear like crazy. Took me 15 mins to get it right for the screen shots.
4. Sound and picture will not tune
5. Very poor RF sensitivity. Even with -15db of signal direct from the cable I still have snow. Local channel oscillator (s) are way out of adjustment.
All of the problems improve as the set stays on longer, so I suspect drifted components in most cases. I've linked some movies i took when I first powered up the set.
First start.
And after some tweaking (ok lots of tweaking)
Screenshot:
I'm stoked! It's coming along now.....