Just curious, do you have these tubes and plan to build an amp for it? They are such rare beauties, I'm very interested to hear about your plans (and the outcome too).
Yes I do have a pair of these tubes as a matter of fact. That's why I was looking for ideas what to use them in. Got lucky had a friend with an two boxes in his attic full of old "junk" radio parts his grandfather kept many years ago. Now they're mine!