SYLVANIA JAN-6SL7GT
MILITARY SPEC | BLACK PLATE | BLACK BASE | MATCHED PAIR
Production: 1950’s
Black Plate
Made in USA
Now available is a strictly matched pair of vintage Sylvania JAN-6SL7GT dual triodes, manufactured in 1950’s. These military-grade tubes feature the sought-after Black Plate construction and a rugged Black Base. Renowned for their high mu and exceptional linearity, these Sylvania units are a significant upgrade for any preamplifier requiring a 6SL7.
Precision tested on our Amplitrex AT1000 digital laboratory system, both tubes show strong performance well above factory nominals. The results below utilize the Percentage Method against original factory design-center specifications (Ip = 2.3 mA / Gm = 1600 µMhos).
| Serial No. | Section | Parameter Ip | Result Ip | % Ip | Parameter Gm | Result Gm | % Gm |
|---|---|---|---|---|---|---|---|
| 3300012 | Triode 1 | 2.3 | 2.8 | 121.7% | 1600 | 1800 | 112.5% |
| Triode 2 | 2.3 | 2.6 | 113.0% | 1600 | 1700 | 106.3% | |
| 3300009 | Triode 1 | 2.3 | 3.0 | 130.4% | 1600 | 1800 | 112.5% |
| Triode 2 | 2.3 | 2.8 | 121.7% | 1600 | 1700 | 106.3% |
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
Quality Verified Since 1970
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