Live vacuum tubes yes.
Dead; no
But like television tubes and any other tube I simply smash the glass (and properly sort and recycle) and sell the remaining of the tube to my local yard as “electrical scrap” which is basically their highest cbm class.
Boardsort isn’t a refinery, and as far as I’m aware there is no refinery in their chain of buyers as a supplier. They have a destination for gold plated scrap but more exotic, and much more difficult to refine, stuff like CMCs are not considered in any valuation. Small RF boards tend to top out at midgrade with few exceptions.
The uproar for CMCs, much like the drive for Pentium Pro processors, are based on misinformation.
One thing you’ll see is ceramic CMC buyers on the Internet rarely last long. They set up a web page, get a few shipments that they over pay for, attempt to refine them and find they can’t even break even. They then flood Ebay with lots of 5-10 lbs of CMCs so they can get out before they loose any more money.
You need many thousands of lbs before values start to kick into them being of use.
If you want something of a how to, that’s realistic, try
Moose on YouTube. He’s one of the few honest ones who won’t step on the scale to save face. So to speak.