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The FMS-413U is in Sams 645-7, which is 1963. Pretty sure I don't have that one...
I have acquired a Zenith MJ-1035 since this thread started, and I'm unhappy to report that it has series heaters and is NOT isolated from the power line! There is a version with 6V tubes, but it is also NOT isolated - it has only a filament transformer. How much more would it have cost to add a plate winding to that transformer? And to think that I ran it with a CD player plugged in... never again!
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