I would stick with the 3DS3 especially where the HV cage is
wide open on C-2 chassii. Normally I am not paranoid about
such things but x-rays I have no way of seeing, measuring etc.
I did spend years with sets basically in my lap. I know after
20 years I was not "shooting blanks" or have other illnesses
after almost 40 yrs.
It would be fun to get one of those X-ray tags from a tech
& run a 3A3, see how long it takes to expose.
GE did spend extra money on this tube, NOT something they
did often at all. The C-2 was a real gut it out til it barely
runs set.
BTW on the left rear of PCB there are 2 2 watt carbon resistors that
go DOWN in value. They are in the video.
The C-2 is in the top 10 of junky sets BUT if you have a good one
they can give a surprizingly good picture.
73 Zeno