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4 x Strong (Test NOS) 1957 RCA Conn 12AU7A Grey Plate Tubes - TV7 Tested
4 x Strong (Test NOS) 1957 RCA Conn 12AU7A Grey Plate Tubes - TV7 Tested
4 x Strong (Test NOS) 1957 RCA Conn 12AU7A Grey Plate Tubes - TV7 Tested

4 x Strong (Test NOS) 1957 RCA Conn 12AU7A Grey Plate Tubes - TV7 Tested

$ 15.84

  • Brand: RCA
  • Country/Region of Manufacture: United States
  • MPN: ECC82
  • Model: 12AU7A
  • Seller Notes: “Tested strong on Dan Nelson restored, upgraded and calibrated, TV7A/U with Digital Meter and mA”
  • Type: Preamp Tubes

Description

Lot of 4 RCA Conn 12AU7A Grey Plate Vacuum Tubes - Test strong and balanced TEST RESULTS: NO SHORTS, NO LEAKAGES, NO GAS Tube 1: Side 1: 89 = 2,225 uMhos Transconductance(Gm) at 7.8 mA (Ia =Anode Plate Current) Side 2: 95 = 2,375 uMhos Transconductance(Gm) at 8.6 mA (Ia =Anode Plate Current) Tube 2: Side 1: 97 = 2,425 uMhos Transconductance(Gm) at 8.0 mA (Ia =Anode Plate Current) Side 2: 88 = 2,200 uMhos Transconductance(Gm) at 7.3 mA (Ia =Anode Plate Current) Tube 3: Side 1: 90 = 2,250 uMhos Transconductance(Gm) at 7.0 mA (Ia =Anode Plate Current) Side 2: 89 = 2,225 uMhos Transconductance(Gm) at 7.4 mA (Ia =Anode Plate Current) Tube 4: Side 1: 94 = 2,350 uMhos Transconductance(Gm) at 8.0 mA (Ia =Anode Plate Current) Side 2: 89 = 2,225 uMhos Transconductance(Gm) at 7.6 mA (Ia =Anode Plate Current) Physical Characteristics on both tubes: (See all Pics) - Grey Plates on all - Slanted Square Getter on all - Date Code: 1957 For Reference: The Minimum good value for a ECC82/12AU7 tube tested on all TV7 versions is 56/56 = 1,400/1,400 uMhos Gm '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. Our Test Set: Dan Nelson restored, upgraded and calibrated, TV7A/U with Digital Meter reading Transconductance in uMhos (Gm) and mA (Anode Plate Current). WE PACK VERY WELL FOR SAFE SHIPPING WORLDWIDE. WE SHIP FAST. MANY YEARS EXPERIENCE SHIPPING FRAGILE TUBES AND VINTAGE ELECTRONICS.