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Seller Store cochran1
(1647) 99.2%,

Location: Rileyville, Virginia
Ships to: US,
Item: 266971094298

Restocking Fee:No
Return shipping will be paid by:Seller
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money back or replacement (buyer’s choice)
National:National
Type:Preamp Tubes
Custom Bundle:No
6679:6679
MPN:12AT7
Country/Region of Manufacture:United States
Modified Item:No

Set of 3 NOS National Electronics 6679 12AT7 Vacuum Tubes – All Triple Mica, D Horseshoe Getters TEST RESULTS: Test NOS NO SHORTS, NO LEAKAGES, NO GAS Tube 1: Side 1: 116 = 5800 uMhos Transconductance(Gm) at 14.2 mA (Ia =Anode Plate Current) Side 2: 98 = 4900 uMhos Transconductance(Gm) at 11.0 mA (Ia =Anode Plate Current) Tube 2: Side 1: 108 = 5400 uMhos Transconductance(Gm) at 11.9 mA (Ia =Anode Plate Current) Side 2: 112 = 5600 uMhos Transconductance(Gm) at 12.9 mA (Ia =Anode Plate Current) Tube 3: Side 1: 107 = 5350 uMhos Transconductance(Gm) at 12.2 mA (Ia =Anode Plate Current) Side 2: 114 = 5700 uMhos Transconductance(Gm) at 13.0 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a 12AT7/6679 tube tested on all TV7 versions is 50/50 = 2,500/2,500 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. NOS is 110/110 = 5,500/5,500 (μ℧ ) uMhos Transconductance (Gm) at 10/10 mA Anode Plate Current Dissipation(+/- 10%) when tested at 250V. TV7’s test 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.

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