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SYLVANIA

JAN-CHS 6SL7WGT NOS NIB SYLVANIA Brown Base Square Getter AMPLITREX Tested Pair Made in USA '50s

JAN-CHS 6SL7WGT NOS NIB SYLVANIA Brown Base Square Getter AMPLITREX Tested Pair Made in USA '50s

₩251,000 KRW
₩251,000 KRW
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JAN-CHS 6SL7WGT NOS NIB SYLVANIA Brown Base Square Getter AMPLITREX Tested Pair Made in USA ’50s

General Description

This pair of JAN-CHS 6SL7WGT SYLVANIA NOS NIB tubes, produced in the United States in the 1950s, represents an absolute top-tier selection, combining military prestige, build quality, and strong sonic identity.

The acronym JAN-CHS (Joint Army-Navy – Contract High Specification) identifies production intended for military use, manufactured according to extremely rigorous standards in terms of reliability, durability, and operational stability.

These tubes feature a typical construction of the more robust and sought-after versions:

  • WGT (reinforced version)
  • Brown Base (elegant and highly resistant brown base)
  • Square Getter (visually striking and distinctive square getter)
  • production SYLVANIA USA – 1950s

This is an NOS NIB (New Old Stock, with original boxes) pair, selected and tested, not just a random match but a quality proposition, chosen for coherence and overall performance.

Although not a matched pair, the tubes show solid electrical behavior and a well-aligned internal balance, making them perfectly usable in many hi-fi and musical applications.

Tested with Amplitrex AT-1000, they achieved:

  • Result: VERY STRONG
  • Internal VTT Classification: VERY STRONG
  • Low Noise & Microphonics

Sonic Characteristics

Bass

Full and well-structured, with a solid foundation that lends stability to the entire sonic range.

Mids

Rich, textured, and deeply musical. Vocals emerge with naturalness and presence, typical of great American production.

Treble

Sweet and refined, with good extension and always smooth, never fatiguing reproduction.

Dynamics

Lively and controlled, with a progressive response that enhances every nuance of the signal.

Soundstage

Wide and three-dimensional, with an airy scene and credible instrument separation.

🎧 Use in Hi-Fi Stereo Amplifiers

Ideal for:

  • tube preamplifiers
  • input stages
  • circuits where stability and musicality are required

Thanks to the WGT construction and JAN selection, they offer reliable performance even in sensitive positions, with balanced and engaging sound reproduction.

🎸 Use in Musical Amplifiers

Perfect for:

  • vintage instrument amplifiers
  • tube preamplifiers

They offer:

  • great expressiveness in the mids
  • natural dynamic response
  • authentic 1950s sonic character

🎯 Note for audiophiles and technicians

  • JAN-CHS – USA military production
  • SYLVANIA – 1950s
  • 6SL7WGT (reinforced version)
  • Brown Base – Square Getter
  • NOS NIB with original boxes
  • Selected pair (not matched)
  • Low Noise & Microphonics
  • VTT Classification: VERY STRONG

A pair that goes beyond simple use: a true testament to American military production, capable of offering reliability, musicality, and a distinctive sonic identity, ideal for those seeking a superior 6SL7.

Test Results:

Tubes tested on Amplitrex AT-1000 Tube tester:

  • Test Conditions: Va = 250V, Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 2.3 mA
  • Test Result: VERY STRONG

Tube 1:

  • Section 1: Gm = 1800 ; Ia = 2.4 mA
  • Section 2: Gm = 2000 ; Ia = 2.7 mA

Tube 2:

  • Section 1: Gm = 1400 ; Ia = 1.7 mA
  • Section 2: Gm = 1500 ; Ia = 1.7 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and compliant for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.
  • Balance: Sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and functional - Supplied in original box.
  • Functionality: Perfectly operational.
  • Cosmetic condition: One Tube Excellent – Markings excellently preserved, minimal signs of age. The other Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.

Manufacturing Code:

  • 510 → Sylvania Electric Products Inc., Emporium, Pa. - 510 → 0 ( three digits ) → 1955 - 10 → 10th week of the year
  • ??? → Sylvania Electric Products Inc., Emporium, Pa. - ??? → undecipherable, identifiable by construction characteristics. 1950s

Discover why our tubes are different →

Terms of Sale & Safety

Sales Terms & Product Safety

Each vacuum tube is carefully selected, tested, and verified in our laboratory before shipment. Where stated in the listing, test results, matching data, and declared characteristics refer to measurements performed using the specified test equipment and operating conditions.

Sound descriptions are provided for guidance only and reflect the characteristics generally associated with that particular tube type. Personal sound preferences, tube rolling, or perceived differences between audio systems do not constitute a product defect.

Before installation, please verify the tube’s electrical and mechanical compatibility with your equipment and follow the manufacturer’s instructions.

New production and NOS tubes are shipped with a tamper-evident security seal and internal technical documentation to ensure traceability of the product’s condition at the time of shipment.

Product Safety (GPSR)

Vacuum tubes are electronic components intended exclusively for use in compatible equipment and must be installed in accordance with the equipment manufacturer’s instructions.

Due to their historical or vintage nature, certain technical specifications may be based on original datasheets or equivalent technical documentation when documentation from the specific manufacturer is unavailable.

Use only with suitable equipment. Keep out of reach of children.

Shipping & Returns

Shipping & Returns

We ship worldwide using carefully selected express carriers and protective packaging specifically designed for vacuum tubes.

If you change your mind, you may exercise your right of withdrawal within 14 days of delivery, where applicable under the relevant consumer protection laws. The product must be returned complete with its original packaging and accessories, in the same commercial condition in which it was received. Return shipping costs are the responsibility of the customer.

Every returned item undergoes a technical inspection. Installation, use, tube rolling, or any other handling may reduce the product’s commercial value and may affect the refund amount, in accordance with applicable law.

If you believe the product has a lack of conformity, our laboratory will carry out the necessary inspections and apply the remedies provided by the applicable consumer protection legislation.

For further details, Customers are invited to consult the “Terms and Conditions” and “Refund Policy” sections of our website, or to contact us before placing an order.

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  • ATTENTION PLEASE

    Please understand that the writing on the glass of vintage valves has become very delicate over the years and comes off easily. You must handle them with extreme care to avoid this. Wear and damage to the writing on the valves reduces their market value and causes damage. Please exercise extreme caution.

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