Hello Derek.
I suggest you perform a close visual inspection of all the wiring and soldered connections before applying any power to the set. Particularly, if the bottom cover plate is missing from the set itself. There should also be a small metal cover over the top of the B-Set chassis. If any of the original military wiring has been changed, it will stick out like a sore thumb as most civilians who tinker with 19-Sets rarely bother to match the original loom on the wiring. Also, over time, the soldered connections take on a recognizable aged patina and the original factory workers did some very neat work. Recent work on the solder will typically be very shiny and sloppy. Also look for any signs wire cutters have been at work "collecting spares for a project".
Repairs and mods done by the military were usually well documented for each set and power supply unit. A small metal card holder would be fastened to the inside of the chassis and a card inserted in it that identified what changes were made and when performed. Sometimes the card goes missing after 60 odd years and all one finds is the empty metal holder, but that at least tells you the military did some appropriate work on the unit at some point in it's service life.
Only other suggestion I have would be to give the entire chassis a good dusting. A cheap set of ladies makeup brushes work very well for this kind of thing. It does not take that much dust to have excess heat build up in old electronic components and if humidity levels get high in your part of the world, enough dust buildup can result in some of the higher voltages in the set arcing to ground and frying the circuit. A lot of CRT televisions have died that way over the years.
Other than that, enjoy the project!
Best regards,
David
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