CT-100 S/N B8002601 is Operational

[Tim]

Hi folks. Here are the first pictures from my CT-100. Still need convergence and purity but I do have video. The color lock problem I noticed on the scope reported earlier turned out to be a bad ceramic capacitor in the burst oscilator.

I also lost the 275 volt line during troubleshooting and found that the field Neut. pot protected my newly added fuse. 275ma should not have been a problem for a 30 ohm 3 watt pot. I had it fused at 315ma. I disassembled it and soldered over the break. It has run Ok since then so I am not sure what caused it to fail. I tried to locate a replacement and tapped pots are just not made any more. Hopefully it will continue to function.

I also had a 6AN8 tube fail while the chassis was on the bench. 5th IF. The Pentode section just quit conducting. Filament is OK. I, of course, initially thought some component went bad. Luckily it was just the tube.

I found that most of the dag came off of the CRT so I had to replace it.

I also uploaded a photo of a service tag from 1956, half a century ago!

In the short time I have played with the set tonight after I got it assembled, I cannot get the Red purity to come in as it should. The manual states that the purity coil should be 1/4" from the tube base but I have to have it up against the yoke to have any kind of decent red field and it is still not that good. Any advancement of the the purity control away from full CCW just makes it worse. Not sure yet if I have just not found the sweet spot or if I have a problem. I'd be interested in any experiences in this area.

It is great to see this old girl running.