There are a couple of choices at Antique Electronic Supply: https://www.tubesandmore.com/search/node/45%20triode?categories%5B0%5D=Vacuum%20Tubes
Type 45 Tubes for stereo amplifiers
I am looking for a source for new or new old stock type 45 tubes for my mono block amplifiers. Everywhere I turn with the exception of Ebay is a dead end. Does anyone know where I can find these for a reasonable price? Thank you