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This looks very nice.
It would be cool to build one in a circle form and cover it with a bell jar like an old ticker tape machine. Stereopile had one a few years ago that used 4CX250s or some similar blower cooled tubes that was in a cylinder and filled with a clear oil for coolant. It looked like an embalming machine to me, and I never saw a picture of it again. An oil leak would be a domestic disaster because you'd never get it out of the carpet.
//www.ebay.de/itm/Rohde-Schwarz-QAO-Quarz-Oszillator-Baugruppe-Modul-fur-Ballempfanger-/320656732935?pt=Radio_TV_Musik&hash=item4aa8a17307
See the picture for an idea.....just bigger and with a flat base. Atwater Kent made a radio like this too IIRC.
I know what you are thinking. Heat retention.
But the glass has a lot of surface area. For a low power amp it would be fine. You could also put a quiet low power fan in the base and put in some holes for forced circulation. The bell jar can go through the dishwasher once in a whole if dust builds up.