-40%
Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested
Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested
Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested
Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested
Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested

Strong Pair AMPEREX HOLLAND HP Select 6DJ8 ECC88 Dimple Disc Tubes - TV7 Tested

$ 15.84

  • Brand: Amperex
  • Country/Region of Manufacture: Netherlands
  • MPN: 6DJ8
  • Model: ECC88
  • Seller Notes: “Test strong on Dan Nelson Calibrated/Upgraded TV7 Digital Meter Gm & mA”
  • Type: Preamp Tubes

Description

Pair HP Amperex 6DJ8 ECC88 Dimple Disc 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: 96 = 12,000 uMhos Transconductance(Gm) at 19.0 mA (Ia =Anode Plate Current) Side 2: 91 = 11,375 uMhos Transconductance(Gm) at 15.8 mA (Ia =Anode Plate Current) Tube 2: Side 1: 90 = 11,250 uMhos Transconductance(Gm) at 15.7 mA (Ia =Anode Plate Current) Side 2: 97 = 12,125 uMhos Transconductance(Gm) at 17.3 mA (Ia =Anode Plate Current) Physical Characteristics: (tubes have identical internal construction) - Etched in glass : 'Δ3B4'= Heerlen, Holland foundry, manufactured 1973 - Gray Thick "Boxed" smooth short plates - Solid metal, "Dimple Disc" Top side Getter supported by 2 wide metal "lifts" - see pic - Seamed tops - "Hewlett Packard, "Made in Holland " " 6DJ8" (see pics) vertical ink "74-4" - These tubes were selected by Amperex and supplied to HP for use in High-End Professional Precision Commercial and Military Test equipment. 'Bogey' = NOS Amperex average Factory Vintage New Spec for a 6DJ8 / ECC88 Twin TRIODE = 12,500/12,500 micromhos (Gm) Transconductance( 100/100 TV7 meter reading) at 15.0 /15.0 mA (Anode) Plate Current (+/- 10%) . Testing on any TV7 tube tester the Minimum Good value is 62/62 where 62/62 = 7,750/7,750 Gm . This represents about 62% of tube life 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.