Description: Pair Tung-Sol 12AX7A ECC83 USA Vacuum Tubes - One branded Zenith other silkscreen worn off. Please see pictures. Digital TV7A/U Test Results: TESTED at 150VDC Plate Supply VoltsNO SHORTS, NO LEAKAGE, NO Gas, NO Micro phonics Detected Tube 1: Side 1: 41 = 1025 uMhos Transconductance(Gm) at 1.1 mA (Ia =Anode Plate Current) Side 2: 42 = 1050 uMhos Transconductance(Gm) at 1.1 mA (Ia =Anode Plate Current) Tube 2: Side 1: 44 = 1100 uMhos Transconductance(Gm) at 1.1 mA (Ia =Anode Plate Current) Side 2: 46 = 1150 uMhos Transconductance(Gm) at 1.2 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a ECC83/12AX7A tube tested is 800/800 uMhos Gm which is about 65% of life. 'Bogey' Specs: 12AX7-12AX7A/ECC83 (Data sheet graphs by RCA,GE & Tung-Sol). Hickok TV-7' test at 150V max. Testing ( Average factory new ):100VDC Plate Supply Voltage : 1,250/1,250 uMhos Transconductance( Gm) at 0.5/0.5mA(Anode Plate Current emissions)150VDC Plate Supply Voltage : 1,300-1,350 uMhos Transconductance( Gm) at 1.1/1.1mA(Anode Plate Current emissions)200VDC Plate Supply Voltage : 1,400/1,400 uMhos Transconductance( Gm) at 1.2/1.2mA(Anode Plate Current emissions)250VDC Plate Supply Voltage : 1,600/1,600 uMhos Transconductance( Gm) at 1.2/1.2mA(Anode Plate Current emissions) Many years of shipping Experience with fragile Vacuum Tubes and Vintage Electronics.
Price: 30 USD
Location: Rileyville, Virginia
End Time: 2025-01-24T20:05:42.000Z
Shipping Cost: N/A USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
Brand: Tung-Sol
Type: 12AX7A
Model: 12AX7A
MPN: Does Not Apply
Country/Region of Manufacture: United States
Unit Quantity: 2
