The JJ 12AY7 from JJ Electronic is also known as the 6072A. It is used in Vintage Amps for example Fender . Also a great valve for improved headroom.
JJ Electronic put the 12AY7 into production in June 2015. It is pin compatible with the ECC83 ( 12AX7) and is has lower gain than the ECC83 / 12AX7. It was used in a number of early Fender Tweed amps in the first pre-amp stage i.e. in the V1 valve position. Many harmonica players favour this valve in the V1 position.
We test every valve ourselves on our in-house AVO valve testers.
We also give a 180 day from receipt warranty on the product ( excludes user caused mechanical damage ) for peace of mind .