Description: Matched Pair Sylvania 12AU7A Vacuum Tubes - Halo Getter - Long Grey Plates - Test NOS+ - Made in USA- Matched and Balanced- Date Codes are different but tubes identical TEST RESULTS: NO SHORTS, NO LEAKAGES, NO GAS Tube 1: Side 1: 103 = 2,575 uMhos Transconductance(Gm) at 9.4 mA (Ia =Anode Plate Current) Side 2: 104 = 2,600 uMhos Transconductance(Gm) at 8.8 mA (Ia =Anode Plate Current) Tube 2: Side 1: 101 = 2,525 uMhos Transconductance(Gm) at 8.2 mA (Ia =Anode Plate Current) Side 2: 101 = 2,525 uMhos Transconductance(Gm) at 7.9 mA (Ia =Anode Plate Current) For Reference: The Minimum good value for a ECC82/12AU7A tube tested on all TV7 versions is 56/56 = 1,400/1,400 uMhos Gm which is about 65% of life. '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(+/- 10%) at 250V. The TV7 tests 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.
Price: 40 USD
Location: Rileyville, Virginia
End Time: 2024-08-30T21:11:31.000Z
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: SYLVANIA
Type: Preamp Tubes
Model: 12AU7A
MPN: 12AU7A
Country/Region of Manufacture: United States
