I have some nice 12AU7s here, singles and pairs available:
RTC/MAZDA French-made 12AU7WA from 1958 with square getter. Gray plates and twin silver top getter support. French signal corps markings, similar to the "S" type tubes above, factory tested for noise and uniform output. Earliest version of 12AU7 with 12AT7-type wing plates RARE - 75 PER TUBE SHIPPED (pairs available at same ship cost).
Ken Rad chromed black plate D-getter - 70 PAIR SHIPPED
Tung Sol D-getter 12AU7 from 1950s - 64 PAIR SHIPPED
All prices shipped (USA); tubes tested, and matched on Amplitrex AT1000 at no extra cost.
thanks
Jon (aka doctorcilantro)
