JAN-CHS-6SN7W SYLVANIA US Navy Black Bakelite Base Tall Bottle Black T-Plates Chrome Top USA

JAN‑CHS‑6SN7W SYLVANIA US Navy Black Bakelite Base Tall Bottle Black T‑Plates Chrome Top - Made in USA AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics Test Results: Tubes tested on an Amplitrex AT-1000 Tube tester: Test Conditions: Va = 250V, Vg = -8V Average 100% Gm = 2600 ; Ia = 9.0 mA Test Result: VERY STRONG Tube Section 1: Gm = 2300 ; Ia = 8.0 mA Section 2: Gm = 2500 ; Ia = 8.6 mA Additional Tests: Microphonics and noise: Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, including the most sensitive audio stages. Balance: Good. The sections exhibit a consistent balance, fully compatible with use in hi-fi environments and musical amplifiers, in all applications where absolute symmetry between sections is not required. Emission: Excellent – Very strong and stable emission, without fluctuations. Shorts / Gas: none Description Rare and sought-after U.S. military-grade JAN‑CHS‑6SN7W Sylvania, manufactured for U.S. Navy supplies, as confirmed by the JAN-CHS designation and the characteristic anchor mark visible on the base. The 6SN7W version represents one of the most highly regarded professional variants of the 6SN7 family, built to strict specifications to offer solidity, stability, and reliability under demanding operating conditions. This specimen features the prestigious Tall Bottle, Black T‑Plates, Chrome Top, and black bakelite base configuration. A construction instantly recognizable and highly sought-after by American vacuum tube enthusiasts, capable of combining high historical interest, remarkable build quality, and excellent audio performance. Based on the construction characteristics, the production can be approximately attributed to the 1950s. The tube has been carefully measured with an Amplitrex AT‑1000. The two sections recorded Gm 2300 / Ia 8.0 mA and Gm 2500 / Ia 8.6 mA respectively, values that confirm very strong emission and good overall balance. Operation was found to be stable and free of fluctuations, with no gas or shorts. The low noise and microphonics allow for its use even in the most sensitive audio stages. It is particularly recommended for hi-fi preamplifiers, headphone amplifiers, driver stages, and guitar amplifiers. The sections exhibit good consistency and are fully suitable for all applications where absolute symmetry between the two triodes is not required. In terms of sound, this JAN Sylvania offers the personality for which the early 6SN7Ws are particularly prized: open, dynamic, and authoritative sound, with natural and well-focused midrange, solid and articulated low frequencies, and extended highs without harshness. The responsive performance and remarkable separation capability contribute to an energetic, detailed, and musically engaging reproduction. A proposal of high interest for those desiring an authentic U.S. Navy JAN Sylvania 6SN7W, in the sought-after Tall Bottle construction with Black T‑Plates and Chrome Top: a specimen that is aesthetically very well preserved, carefully tested, and ready to enhance quality audio equipment. Conditions Conditions: Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection. Functionality: Perfectly operational Aesthetic conditions: Excellent – Markings well preserved, minimal signs of aging. See photos for details. Manufacturing code: Code illegible. Production approximately attributable to the 1950s based on construction characteristics. Discover why our tubes are different →