I wanted to take a look at the brightness issue before I went to bed so I studied the
schematic from the brightness control to the CRT and I found a cap I overlooked.
I didn't pay much attention to it because it was the Domino style and I was probably thinking it was a Mica, however the schematic showed it to be a .05@600 and most likely just a common paper cap, why they used this one odd style I don't know, maybe it was supposed to be better quality.
It's cap# 58 on the
Sams, between the 6V6 Video Output and the 6AL5 DC Restoration tube, from there it goes to the Grid of the CRT.
As soon as I turned it on I could tell it was better, not only does the video and brightness work now but the sync is fixed too.
I tried it with the 5TP4 also but still with only 10kv on the Anode, the tube works but I can't get any focus with so little HV.