-40%
Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested
Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested
Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested
Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested
Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested

Pair NOS GE 12AT7 ECC81 Vacuum Tubes - Tv7 tested

$ 13.2

  • Brand: GE
  • Country/Region of Manufacture: United States
  • MPN: 12AT7
  • Model: ECC81
  • Seller Notes: “Test NOS on Dan Nelson restored, upgraded and calibrated, TV7A/U with Digital Meter.”
  • Type: Preamp Tubes

Description

Pair NOS GE 12AT7 ECC81 Vacuum Tubes Digital TV7A/U Test Results: TESTED at 150VDC Plate Supply Volts NO SHORTS, NO LEAKAGE, NO Gas, NO Micro phonics Detected Tube 1: Side 1: 86 = 4300 uMhos Transconductance(Gm) at 10 mA (Ia =Anode Plate Current) Side 2: 83 = 4150 uMhos Transconductance(Gm) at 8.7 mA (Ia =Anode Plate Current) Tube 2: Side 1: 92 = 4600 uMhos Transconductance(Gm) at 12.5 mA (Ia =Anode Plate Current) Side 2: 81 = 4050 uMhos Transconductance(Gm) at 9.7 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a ECC81/12AT7 tube tested on all TV7 versions is 50/50 = 2500/2500 uMhos Gm which is about 65% of life. Bogey: Factory Data Sheet NOS when new is 80/80 = 4,000/4,000 (μ℧ ) uMhos Transconductance (Gm) at 3.7/3.7 mA Anode Plate Current Dissipation(+/- 10%) when tested at 100V. All TV7's test at 150V. WE PACK VERY WELL FOR SAFE SHIPPING WORLDWIDE. WE SHIP FAST. MANY YEARS EXPERIENCE SHIPPING FRAGILE TUBES AND VINTAGE ELECTRONICS.