Tube question - who makes Magnum Dynalab Reference 6922 Cryovalves??

"The tubes (both old/new production) were later cryo'd by outsourced providers."

That's exactly what I said too, or was trying to say.

I strongly doubt that any real tube manufacturer ever cryo-treated their product.  In my experience, that is always an option occasionally offered by the better tube vendors.  But I am always willing to learn something new.

6922s are very plentiful, similar to 6DJ8 and 7308. If you want reliable sources, I’d suggest RAM Labs, Jim McShane, Antique Electronic Supply, Kevin (can’t recall last name). I have left out other reliable sellers, but don’t buy off eBay unless you have independent evidence that the seller is honest. Some of these sources will do cryo, if you pay a bit extra.