Description
2 new tubes Siemens E283CC 3 mica professionell style Factory code " F19 0 ≠ G " Test result (with Roetest V11): S/gm = 1,6mA/V ±0,2mA/V (100% = 1,6mA/V - ) This is a really perfect pair of E283CC tubes with original boxes Only the slope/gm S/gm provides information about the emission Further explanation: According to military standards, tubes with 60% (minimum value) were classified as usable.