Thanks, but I haven't really fixed it yet, HV is only half of what it should be and FM radio reception is overpowering on channels 2-4.
I tested the mica caps in the horizontal circuits and they're fine. I also replaced the 1 Meg and 3.3 ohm resistor under the HV socket. No improvement. That pretty much just leaves the flyback.
When I first got the set, I tested the flyback using an EICO 944 and Sencore VA-62. I got odd readings on both indicating there might be an issue. However, I got identical readings with another 630TS fly and I figured the odds of them both failing in the same way were unlikely. Also, since I do get horizontal deflection on the CRT it seems to me the fly must be OK