Strong Pair Sylvania 12AX7 ECC83 Long Plate Halo Getter Tubes – TV7 Tested NOS

$45.0 Buy It Now or Best Offer
free,30-Day Returns

Seller Store cochran1
(1647) 99.2%,

Location: Rileyville, Virginia
Ships to: US,
Item: 267099155332

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
SYLVANIA:SYLVANIA
Type:Preamp Tubes
12AX7:12AX7
MPN:12AX7
Country/Region of Manufacture:United States
Unit Quantity:1

Strong Pair (Test NOS+) Sylvania 12AX7 ECC83 Vacuum Tubes – Marked Baldwin – Matching Date Codes: 312 526 (1965) Digital TV7A/U Test Results: TESTED at 150VDC Plate Supply VoltsNO SHORTS, NO LEAKAGE, NO Gas, NO Micro phonics Detected Tube 1: Side 1: 79 = 1975 uMhos Transconductance(Gm) at 2.1 mA (Ia =Anode Plate Current) Side 2: 83 = 2075 uMhos Transconductance(Gm) at 2.3 mA (Ia =Anode Plate Current) Tube 2: Side 1: 82 = 2050 uMhos Transconductance(Gm) at 2.3 mA (Ia =Anode Plate Current)Side 2: 76 = 1900 uMhos Transconductance(Gm) at 2.0 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a ECC83/12AX7 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). TV7 tests 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) 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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