Old tubes are out there, and if you personally go hunting up old tube electronics in "Penny Savers", small flee markets and church sales, you can likely find what you need.
Years ago I was no able to load up a tall boy radio all tube type, from the street, and the trash collector's truck was a scant dozen houses away, so I careful ly yanked a small number of tubes, for photo props, etc and several years latter salvaged a half dozen from an artist made floral center piece, for a Holiday Art League Gathering.
The artist that made these decorations, also took natural floral elements flowers, etc, and reeds gathered recently collected which were topped with old tubes (all good, IIRC) and brightly coloured aluminium tinsel wound down each reed.
This and the Radio are completely unexpected finds, as well as a 1960's Sear's guitar tube amp, and I'm sure some good hours hunting up what you want will give joy and finds for your project.
By the way, my Father's family loved the good quality electronics of the 50's & 60's, and I remember one large range frequency scale brown Baklite Radio in my Grandmother's upper rooms, that got short wave and AM radio, very clear, robust sounding and a clarity of signal I would no experience again until these latter years of streaming of media has produced.
I love good, clear music and radio, but I would love to have kept this radio and a 1960's RCA HiFi portable, heavy turn table record player, which used tubes to, of my Father's, which disappeared when I joined the army at 17.
Also, do no forget old TVs used tubes as well, so hunt up some old time repair shops as well, especially in small towns.
