Seller: audiotubes_de✉️(11,259)100%,
Location:Altusried, DE,
Ships to: WORLDWIDE,
Item:1349835255422 tubes ECC81 12AT7 Telefunken diamond matched pair. 2 tubes Telefunken ECC81 = 12AT7 Diamond on bottom for any: E81CC ECC801s QS2406 M8162 12AT7WC 6201 12AT7WA, M2462-479 matched pair Test result (with Roetest V11) S/gm = 5,5 + 5,2 and 5,6 + 5,2mA/V (100% = 5,5mA/V - usable starts with 3,8mA/V) Final assessment: 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.