Sun MDT distributor tester

I wish someone knew something about this machine. It evidently is a VERY early SUN machine, like real early 40's. It has some capacitors that have 1936 date codes on them. Runs on 6V only. Kinda works, intermittent then peters out all together, like something getting hot and quitting?
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I can't help you, but that's a very cool machine. Thank you for preserving it.