KEN-RAD JAN 6SL7GT – MATCHED PAIR (2 PCS)
Black Plate
Black Base
Bottom Leaf Getter
JAN Military Spec (6SL7GT / 6SL7)
Made in USA
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of genuine vintage NOS Ken-Rad JAN 6SL7GT high-mu dual triode vacuum tubes, manufactured in the USA and supplied in white boxes. Highly sought after for their iconic deep bass punch, thick midrange warmth, and exceptionally low microphonics, these Joint Army-Navy (JAN) military-spec tubes feature rich black plates, black bases, and bottom leaf getter construction. A legendary upgrade choice for audiophile preamplifiers, line stages, and high-gain audio applications taking 6SL7 / 6SL7GT / 5691 series tubes.
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.3298015 | Triode 1 (T1) | 2.3 mA | 2.6 mA | 113% | 1600 | 1900 | 119% |
| Triode 2 (T2) | 2.3 mA | 2.7 mA | 117% | 1600 | 1880 | 118% | |
| SR.NO.3298012 | Triode 1 (T1) | 2.3 mA | 2.9 mA | 126% | 1600 | 1900 | 119% |
| Triode 2 (T2) | 2.3 mA | 3.1 mA | 135% | 1600 | 2000 | 125% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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