[kruc]

Tex, it sounds as though you've got quite a stash. There's a market for what you've got, especially the UTC stuff as it was good quality and hasn't been made in years. I'd guess the scratchbuilders are the ones looking for the old stuff. I was making a crystal radio a few years ago that called for a UTC A-12 and the price and availability led me to use whatever I could find. I just did a ePay A-12 search and there's 3 listings, 1 in OZ and 2 in China. Prices range from $100 to nearly $150 each. The tubes have their niche market also, if you've noticed the 300B ranges from $80 for imports to over $1k for the original WE version. The demand for the 300B was so high that WE started making them again. I'm sure you've seen the same type of obsession from musicians with their amps.
Since you made the spare parts offer, I'm looking for something similiar to the A-12 for the crystal set. 100k primary and 600 ohm secondary.
Dave