My CTC-16XL Project.

[maxhifi]

Originally Posted by Yamamaya42

I may be overthinking this, but to me , this sawtooth wave here (at C1a) just does not seem right, but the SAMS does not have a reference for a wave at that exact point, I have replaced C1a with an much larger cap and am still seeing it, its mostly filtered out by L45, but I don't think it should be there at all, its still present at the end of the 400v source ( very faint )

I'm running the set with HV disabled ( yolk disconnected ) when this wave was captured.
I have not replaced the LV rects yet ( they are hard to get to ) but I plan to, as I suspect them to be a problem. ( unless someone thinks that sawtooth I'm seeing is normal ) as mentioned, I chose 1N4005G for that as they looked rather close to what was in there..

https://imgur.com/a/U5mvTBT
https://imgur.com/a/6vEuABP

If you're getting a sawtooth waveform at first filter capacitor, don't be too surprised. These sets use a voltage doubler power supply, and it's going to have lots of ripple at the first filter. In other words, I'd kind of expect a sawtooth there.

Where did you get C1A from? What cap is it on the RCA schematic? Is that a sams or an RCA part number?

https://www.boxcarcabin.com/rcaschematics.html has most of the early rca schematics.

I sold my CTC16 some time ago, but it was a cool TV. Make sure to check for bad soldering of power resistors, and also I'd go over the chassis ground points. The spots where the boards are soldered to the chassis can cause intermittent issues if the solder isn't good, it would be a good idea to re-flow them. Clean all the tube sockets too.