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Yes, it is a 5J6, I pulled all the tubes the other day and tested them. That three piece chassis is really strange.. in all the prints I have looked at I can't find it anywhere. Thank you again for trying to find this...
With the 5J6, it's probably a 21mc IF. The 41mc tuners used different tubes.
The Admirals of the day were strange in that respect. The VHF only sets were 21mc, where the UHF/VHF models were 41mc.