Then you charge too low for your amps...jack 'em up!
A full set for the WA5 comes pretty close. Fortunately the Glenn amp only uses the 300Bs.
They are freaky expensive, but all the very top end 300Bs are. Compared to vintage WE300B / WE274B they are practically cheap.
Please wait until I have mine safely delivered before putting such ideas in Glenn's head
Thinking about it. I don't want a 300B type tube amp tho. Too expensive for the tubes.
Also a piece of art. You should be happy.
WA7 is mighty purdy (for those that have seen Deliverance more than once).
Woo Audio can supply them. I got mine from Price Japan - they were great to deal with.