Auction is for two (2) fully tested NOS tubes, platinum matched pair of rare E83CC Siemens NOS NIB (ECC83 12AX7 premium long life triple mica substitution) made in famous Siemens & Halske tube plant in Munich in West Germany in 60s.

 

They are real vintage NOS gems, very rare triple mica version, no microphonics at all, with special cathode coating for 10000 hours of use within manufacturer's specifications.

One of the best ever ECC83 / 12AX7.

They are tested with 250V on plates and -1.5V on grids, 100% for NOS tube at these voltges is 2.15mA, the results are:

(2.3/2.3)

(2.3/2.4)