03-22-2017, 03:14 AM
Is it a complete 37-623B or just the cabinet from same? If it has the chassis and speaker with it I think I would just restore the set as is, and build a power supply for it. I'm not sure whether a 37-640B chassis would fit in the cabinet or not, the 37-640 has seven tubes and a power transformer, get someone who has one to measure it.
Regards
Arran
Regards
Arran