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This amp looks like it has been in a time capsule. I would guess it is from the early to mid-1940s. Anybody out there have a clue? The tubes are unfamiliar and the socket pin count is squirrel-y, with extra cap connectors on some of the tubes. Each tube also has a three piece “man in the iron mask” shield that clasps around it. The construction is so bullet-proof that it is no wonder it survived. It has a field coil speaker that predates the common use of permanent magnets. This field coil also doubles as a power supply choke.
Ingenious! Beautiful simplicity, and it sounds terrific to boot. Gutsy, yet open.
