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