12 ax7 is
     100%...12AT7-12AU7-12AY7-12AX7WA-7025.

The 12AX7, the WA, 7025 should all be pretty much the same.

I did some poking around with this awhile ago. Here's what I came
up with. Common denominations will be first, and the number taken
from tube sheets or Tom Mitchell's Tube Design Register in (these).

12AU7--20 (17.5)
12AY7--40 (44)
12AT7--60 (54)
5751--- (78)
12AX7--100 (98.3)

bw