Hallicrafters T-67 HV corona ring

[dcl0]

Thirty years ago I bought a Hallicrafters T-67 at a junk store in Washington DC. The seller warned me "careful, its a sparker!" Its been sitting in my attic ever since. After coming across the videos from bandersentv, I got motivated, pulled it down and looked it over. Yes there is significant carbon build up at the terminal atop the 1B3GT HV rectifier tube, but the flyback is pretty clean. However I noticed that there is no corona ring on the socket underneath the 1B3GT. Shouldn't there be one? Also looking at the SAMS picture, it looks like there is a cover over the 1B3GT top terminal - is this true? - mine's missing.