SYLVANIA JAN-6SL7GT – MATCHED PAIR (2 PCS)
Black Plate
Black Base
Made in USA
High-Gain Dual Triode JAN-6SL7GT / 6SL7
New in Original GVT Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of genuine vintage NOS Sylvania JAN-6SL7GT dual triode vacuum tubes, manufactured in the USA and supplied in their original military GVT boxes. Built to strict Joint Army-Navy (JAN) specifications, these tubes feature rugged black plates, sturdy black octal bases, and exceptional construction standards. Renowned for rich harmonic texture, dynamic headroom, and musical transparency, the 6SL7GT is an elite upgrade for high-end hi-fi preamplifiers, phono stages, and vintage instrument amplifiers.
Both tubes have been fully tested on a precision Amplitrex AT1000 tube tester. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 2.3 mA / 1,600 uMhos) are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO.3300023 | Triode 1 | 2.3 mA | 2.2 mA | 96% | 1600 | 1600 | 100% |
| Triode 2 | 2.3 mA | 2.7 mA | 117% | 1600 | 1700 | 106% | |
| SR.NO.3300011 | Triode 1 | 2.3 mA | 2.6 mA | 113% | 1600 | 1600 | 100% |
| Triode 2 | 2.3 mA | 2.5 mA | 109% | 1600 | 1700 | 106% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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