An interesting (if useless) find

[John Folsom]

The HV cable assembly looks like a Westinghouse (note the in-line connector the plate cap of the 6BD4).

[John Folsom]

The 15HP22 was electrically and mechanically compatible/interchangeable with the 15GP22. The only noticeable difference was the 15HP22 required somewhat less AC convergence correction waveform due to the curved shadow mask and curved phosphor dot screen.