-40%
Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested
Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested
Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested
Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested
Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested

Matched Balanced Pair Sylvania 12AU7A / ECC82 Tubes Test NOS+ - TV7 Tested

$ 15.84

  • Brand: SYLVANIA
  • Country/Region of Manufacture: United States
  • MPN: 12AU7A
  • Model: 12AU7A
  • Seller Notes: “Matched/Balanced. Test NOS+ on Dan Nelson Calibrated/Upgraded TV7 Digital Meter Gm & mA”
  • Type: Preamp Tubes

Description

Matched Pair Sylvania 12AU7A Vacuum Tubes - Halo Getter - Long Grey Plates - Test NOS+ - Made in USA - Matched and Balanced - Date Codes are different but tubes identical TEST RESULTS: NO SHORTS, NO LEAKAGES, NO GAS Tube 1: Side 1: 103 = 2,575 uMhos Transconductance(Gm) at 9.4 mA (Ia =Anode Plate Current) Side 2: 104 = 2,600 uMhos Transconductance(Gm) at 8.8 mA (Ia =Anode Plate Current) Tube 2: Side 1: 101 = 2,525 uMhos Transconductance(Gm) at 8.2 mA (Ia =Anode Plate Current) Side 2: 101 = 2,525 uMhos Transconductance(Gm) at 7.9 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a ECC82/12AU7A tube tested on all TV7 versions is 56/56 = 1,400/1,400 uMhos Gm which is about 65% of life. 'Bogey': Factory Data Sheet NOS when new is 88/88 = 2,200/2,200 (μ℧ ) uMhos Transconductance (Gm) at 10.5/10.5 mA Anode Plate Current Dissipation(+/- 10%) at 250V. The TV7 tests at 150V. Our Test Set: Dan Nelson restored, upgraded and calibrated, TV7A/U with Digital Meter reading Transconductance in uMhos (Gm) and mA (Anode Plate Current). Many years of shipping Experience with fragile Vacuum Tubes and Vintage Electronics.