I have two of each of these valves, all tested but never used.
The 12AY7 is 45% gain compared to the 100% gain of a 12AX7. Useful if you want to tame a lively preamp!
2 x Electro Harmonix - £13.50 each new, so I'll take £11 each, or both for £20
2 x JAN GE new old stock, US made for military use, grey anode, disc getter, original box - cost me £33 each, I'll sell them for £30 each or both for £58.
Please note that prices do NOT include postage. Pick up also available from Central London or NE Hampshire.
Cheers
Gareth