Neither the OP nor the Title says anything about specifically
Antique tube clock radios, so I am going to mention my project, and link to my website.
http://linuxslate.com/Project_NodeMCU_Clock.html
It's tube since it uses a VFD display, But as it exists currently, it doesn't have a radio at all. In fact, the simple alarm files it plays sound
horrible. (The PCM integrator is just the combination of a resistor and the DC block at the input of the amp module I used. -- Look, Ma -- No math!)
I have seriously considered using the same VFD tube (I have several), along with a little more CPU power, a dedicated DAC, and a basic tube amplifier to make a internet clock radio that is simultaneously high tech, and retro.
As the introduction mentions, there really aren't any products out there that meet my requirements for a clock radio.
It's not mentioned in the article, but an additional requirement that I have had in mind since I built that would, of course, be all tube amplification after the DAC.
A variation that might also meet my "requirements", could be a tube amplification smart speaker. There are plenty of projects out there to built Alexia or Google Assistant smart speakers, so building (or re-building a commercial product) with a VFD (or better yet -- Nixie) display, and tube audio should be fairly easy.
There is a 12V powered SE stereo tube amp sold on ebay (can't find link at the moment) that I would use for the amplifier.
One "free" benefit of using tube audio is that the warm-up of the tube would give a "natural" or "soft" wake-up with out needing to do it in the software.
It would use external bookshelf speakers.
I'm sure the Chinese, or somebody is going to make a "retro" smart speaker in the near future.