KEN-RAD JAN 12SN7GT – MATCHED PAIR (2 PCS)
GRADE: PLATINUM SERIES | VINTAGE US MILITARY JAN-CKR DUAL TRIODES
Ken-Rad JAN-CKR-12SN7GT
Black Plates
Bottom Square Getter
Black Base
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of vintage NOS Joint Army-Navy Ken-Rad JAN-CKR-12SN7GT dual triode vacuum tubes, packaged in white boxes. Manufactured in the USA, these legendary military tubes feature black plates, sturdy black bases, and rare bottom square getters. Ken-Rad 12SN7GT / 6SN7 family tubes are world-famous among audiophiles for delivering some of the deepest, punchiest bass response and richest low-end impact available in the 8-pin octal triode family, combined with a smooth, authoritative midrange presentation.
As shown, both tubes have been thoroughly tested on an advanced Amplitrex AT1000 tube testing system in full fixed-bias mode. Plate current (Ip) and mutual conductance (Gm) measurements alongside percentage performance ratings relative to nominal factory specs are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Transconductance (Gm) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % Gm | ||
| SR.NO. 4718004 | T1 | 9.0 mA | 9.6 mA | 107% | 2600 µMhos | 2800 µMhos | 108% |
| T2 | 9.0 mA | 9.7 mA | 108% | 2600 µMhos | 2700 µMhos | 104% | |
| SR.NO. 4718008 | T1 | 9.0 mA | 10.0 mA | 111% | 2600 µMhos | 2700 µMhos | 104% |
| T2 | 9.0 mA | 10.6 mA | 118% | 2600 µMhos | 2800 µMhos | 108% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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