Four Siemens E83CC 6057 12AX7 NOS in originals boxes audio amplifier tubes, all tubes test good and the test readings on my Stark Dynamic Mutual Conductance Model 12-22 Tube Tester are 1930-1950; 1920-1900; 1880-1860; 1950-1920. Minimum good reading on this tester is 1500. Please check out my other auctions, thanks!