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That set has the earlier UV sockets, which were originally for the short-pin tubes mounted bayonet-style like auto bulbs with the pin ends pushing against the contacts. The later and much more available UX style 01A's with long pins will still fit in these sockets.
The fact that it uses the older style sockets makes me think early twenties as the long pins were introduced in 1925. It has spiderweb coils. Whether it's homebrew or not you'll be able to tell once you get it. Looks very interesting and for $25 I'd sure grab it.
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Reece
Perfection is hard to reach with a screwdriver.
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