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SYLVANIA

6SN7GTA NOS SYLVANIA Chrome Top Matched Quad - Same Production Code - Low Noise & Microphonics - AMPLITREX Tested

6SN7GTA NOS SYLVANIA Chrome Top Matched Quad - Same Production Code - Low Noise & Microphonics - AMPLITREX Tested

HK$3,113.00 HKD
HK$3,113.00 HKD
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6SN7GTA NOS SYLVANIA – Short Base Chrome Top – Matched Quad – Same Data Codes – Made in USA 1955

AMPLITREX Tested – VERY STRONG – Green Dot & Gray Dot – 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 #15

  • Section 1: Gm = 2600 ; Ia = 8.2 mA
  • Section 2: Gm = 2600 ; Ia = 8.0 mA

Tube #22

  • Section 1: Gm = 2500 ; Ia = 8.0 mA
  • Section 2: Gm = 2700 ; Ia = 8.4 mA

Tube #5

  • Section 1: Gm = 2600 ; Ia = 8.4 mA
  • Section 2: Gm = 2600 ; Ia = 8.2 mA

Tube #39

  • Section 1: Gm = 2620 ; Ia = 8.6 mA
  • Section 2: Gm = 2600 ; Ia = 7.8 mA

Additional Tests:

  • Burn-in / Stability Test: 48h – OK
  • Microphonics and noise: Very Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, including the most sensitive audio stages.
  • Balance: Very good. The sections are consistent and well-matched, making the tube suitable for use as a phase inverter in hi-fi and instrument applications.
  • Emission: Excellent – Very strong and stable emission, without fluctuations.
  • Short Circuits / Gas: absent

Description

Exceptional NOS 6SN7GTA Sylvania quad, produced in the United States in 1955 and carefully selected as a Matched Quad. All four specimens share the same manufacturing code and feature the sought-after Short Base Chrome Top construction, with black plates and top getter, a characteristic of the prestigious Sylvania American production of the 1950s.

The measurements performed with the Amplitrex AT-1000 show very consistent values: the individual sections have a transconductance between Gm 2500 and 2700, while the anode current is within the narrow range of 7.8–8.6 mA. These results confirm an electrically well-matched quad, with balanced sections and consistent performance across all four specimens.

Each tube was subjected to 48 hours of burn-in and stability testing, in addition to specific noise and microphonics checks. The Green Dot and Gray Dot selection identifies specimens characterized by very low noise and microphonics, suitable even for the most sensitive audio stages.

Thanks to its excellent electrical uniformity, this quad is particularly suitable for preamplifiers, headphone amplifiers, balanced circuits, driver stages, buffers, and phase inverters, as well as high-end hi-fi equipment requiring four 6SN7 tubes with consistent characteristics.

These 6SN7GTAs express the traditionally appreciated qualities of Sylvania production: an open, dynamic, and natural presentation, accompanied by excellent transparency, definition, and control.

A rare matched NOS quad, originating from the same production batch from the 13th week of 1955, intended for the most demanding enthusiasts and collectors seeking authentic American Sylvania tubes that are consistent and carefully selected.

Condition

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational
  • Aesthetic condition: Excellent – Markings optimally preserved, minimal signs of age. See photos for details.
  • Special selection: Green Dot and Gray Dot, with low noise and microphonics verified using Amplitrex AT-1000.
  • Manufacturing code: Sylvania Electric Products Inc., USA – original marking on the base 288 / 513. 288 is the internal Sylvania code. 513 - 13th week of 1955 (March 1955).

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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