Your set is a great find. I just picked up an RA112-A3 with exactly the same chassis except it has the 19AP4 round tube. This is my first set with the mallory "Inductuner". I did a google search on the inductuner and it seems it still is a current Mallory product!
http://www.duracap.com/inductuners/vhf400series.htm
The CRT in your set looks all glass and so I thought it would be either a 17AP4 or a 17BP4?
I have the same cabinet issues and it is too cold for refinishing so I'll concentrate on the chassis this fall.
It will be interesting to compare problems with these chassis's.