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SYLVANIA

6SN7 GTA NOS PHILCO by SYLVANIA CHROME TOP AMPLITREX Tested Tube Made in USA '50s

6SN7 GTA NOS PHILCO by SYLVANIA CHROME TOP AMPLITREX Tested Tube Made in USA '50s

€69,90 EUR
€69,90 EUR
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6SN7GTA NOS PHILCO by SYLVANIA CHROME TOP AMPLITREX Tested Tube Made in USA '50s

Description:

This 6SN7GTA NOS Philco by Sylvania, manufactured in the USA in the 1950s, is a tube that combines the historical prestige of the Philco brand with the solid construction of Sylvania USA, one of the most highly regarded manufacturers of its time.

Philco branded tubes were often selected for high-quality radio and audio applications, and in this case, we find a construction clearly traceable to Sylvania production, featuring the distinctive and sought-after Chrome Top, an iconic element both aesthetically and technically.

Construction features:

  • Chrome Top (extended top getter flashing)
  • robust and well-aligned internal structure
  • USA production from the 1950s, a benchmark period for quality and reliability

The Chrome Top indicates excellent internal vacuum quality, contributing to long-term stability and consistent performance.

The tube has been tested with Amplitrex AT-1000, achieving a VERY STRONG rating, and has been verified for Low Noise & Microphonics, making it suitable for even sensitive stages.

Sonic Characteristics

Sylvania Chrome Top 6SN7GTAs are known for an open, refined, and highly musical sound, with extremely balanced reproduction.

Bass

Controlled, fast, and well-articulated, with excellent intelligibility even in the most complex lines.

Mids

Natural and transparent, with extremely credible and engaging vocal reproduction.

Highs

Extended and airy, with excellent brightness yet always free from harshness.

Dynamics

Responsive and fluid, with excellent ability to follow subtle signal variations.

Soundstage

Wide and three-dimensional, with precise placement of instruments in space.

🎧 Use in Hi-Fi Stereo Amplifiers

Perfect for:

  • high-end preamplifiers
  • integrated amplifiers and power amplifiers with 6SN7 drivers
  • buffers and line stages

Ideal for systems requiring transparency, a wide soundstage, and great definition, without sacrificing the typical musicality of American NOS tubes.

🎸 Use in Instrument Amplifiers

In musical applications, it offers:

  • great clarity and definition
  • controlled dynamic response
  • excellent frequency separation

Suitable for configurations where precision and signal purity are required, while maintaining a pleasant and non-fatiguing sonic character.

🎯 Note for Audiophiles and Technicians

This 6SN7GTA Philco by Sylvania Chrome Top represents a highly interesting tube for both practical use and historical value.

The Philco brand, combined with Sylvania production from the 1950s, guarantees solid construction and recognized sound quality.

The VERY STRONG test result on Amplitrex, along with the Low Noise & Microphonics verification, confirms a stable, quiet tube ready for even demanding applications.

An ideal choice for those seeking a 6SN7 with an open, precise, and three-dimensional sound, boasting the authenticity and charm of great vintage American production.

Test Results:

Tubes tested on Amplitrex AT-1000 Tube tester:

  • Test Conditions: Va = 250V, Vg = -8V
  • Average 100% Gm = 2600; Ia = 9.0 mA

Tube:

  • Section 1: Gm = 2400; Ia = 7.2 mA
  • Section 2: Gm = 2580; Ia = 7.6 mA
Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections are consistent and well-aligned, making the tube also 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 - New Old Stock - Tested and functional - Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Markings very well preserved, minimal signs of age. See photos for details.
    Manufacturing Code: 312 5421 - 312 → EIA code Sylvania Electric Products Inc., New York 19, N. Y. - 5421 → 21st week of 1954

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.

Vacuum Tubes Treasures
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📧 info@vacuumtubestreasures.com

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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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    We wish to inform you that any attempts to manipulate shipping destination information in order to obtain lower shipping rates may be considered fraudulent acts. Please provide accurate information and contact us if you have any concerns. We reserve the right to review and, if necessary, cancel orders that we deem to be in violation of our conditions. Thank you for your understanding and cooperation.