For Sale is an extremely rare and practically extinct 12au7 variant. These are 1959 CBS 7318 tubes. They are very quiet and free of microphonics.The best 12au7/5814 tube I've heard. Last in excess of 20,000 hours. Extremely well made. As you can see in the pictures, the print is practically gone on the one tube and almost gone on the other.
450.00
These are truly exceptional tubes. The readings are as follows:
1518/1509
1515/1530
Anything above 1400 on this tester is considered NOS levels.
