Pair of Sylvania 12SN7GTA NOS Tubes – Dual Triode
We proudly offer an immaculate Pair of Sylvania 12SN7GTA NOS Vacuum Tubes, a true gem for analog audio enthusiasts and Hi-Fi equipment builders. These vacuum tubes are one of the industry’s best-kept secrets, delivering the same sonic signature, linearity, and performance characteristics as the highly acclaimed 6SN7GTA, while operating with a 12.6V heater voltage.
Condition, Testing & Certification
Confidence is essential when purchasing vintage electronic components. This Pair of Sylvania 12SN7GTA NOS Vacuum Tubes comes New in Original Boxes (NIB – New In Box). To ensure 100% functionality, each tube has been thoroughly tested on a Hickok 8000 tube tester, verifying strong mutual conductance (Gm), no gas leakage, and no internal shorts. They are fully certified and ready to deliver thousands of hours of pristine, high-fidelity audio performance.
TUBE 12SN7GTA PAIR SYLVANIA VACUUM TUBE 12SN7GTA
Manufacturer History: Sylvania Electric Products
Sylvania Electric Products was one of the most respected pioneers in vacuum tube manufacturing in the United States during the 20th century. Renowned for its military-grade quality control (JAN) and rugged plate designs, Sylvania tubes—especially those in the SN7 series—are highly prized by audiophiles for their balanced frequency response, tight bass, and crystal-clear highs without harshness.
Applications and Uses of the Pair of Sylvania 12SN7GTA NOS Vacuum Tubes
Audiophiles and Audio Purists: Ideal for high-fidelity stereo preamplifiers.
DIY (Do-It-Yourself) Projects: Perfect for single-ended or push-pull amplifier builds where the filament power supply can be configured for 12.6V operation.
Audio Engineers: Excellent for use as a phase inverter or voltage gain stage in vintage studio equipment and professional audio gear.
Technical Specifications
Tube Type: Medium-Mu Twin Triode.
Base: 8-Pin Octal (Octal Base).
Heater Voltage: 12.6 V.
Heater Current: 0.3 A.
Maximum Plate Voltage: 450 V (The 12SN7GTA version is rated to handle higher plate voltages than the standard 12SN7GT).
Maximum Plate Dissipation: 5.0 W per plate / 7.5 W total (both plates combined).
Amplification Factor (μ): 20.
Transconductance (Gm): 2,600 µmhos (Nominal Value).
(FAQ)
Q: What is the difference between a 12SN7GTA and a 6SN7GTA tube?
A: Electrically and sonically, they are identical. The only difference is the heater voltage: the 12SN7GTA requires a 12.6V heater supply, while the 6SN7GTA operates with a 6.3V heater supply.
Q: What does the “NOS” designation mean?
A: NOS stands for New Old Stock. These are vacuum tubes that were manufactured decades ago but were never put into service. They remain unused and preserved in their original factory condition, making them highly desirable for restorations, vintage equipment, and high-fidelity audio applications.
Q: Are these tubes matched for stereo use?
A: Yes. This Pair of Sylvania 12SN7GTA NOS Vacuum Tubes has been tested on a Hickok 8000 tube tester to verify closely matched transconductance (Gm) values, making them ideal for high-fidelity stereo applications where channel balance and consistent performance are essential.
Q: Are these tubes guaranteed to be free of shorts or gas leakage?
A: Absolutely. Both tubes have been thoroughly tested on a Hickok 8000 tube tester and are verified to be free of internal shorts, gas leakage, and excessive microphonics, ensuring reliable operation and dependable performance.
