How are you coming along on this?
I have a 465 non-B also but it is ok although a bit old in the crt teeth.
I am retired from the grind, but was a test equipment department tech, boss, slave for avionics companies.
Found a way to heat my basement, so have 535, 575 curve tracer, 555, other storage Teks and HPs to play with during blizzards.
Don't plan to run any on UPS's.