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SYLVANIA

6SN7GT SYLVANIA Metal Base Tall Bottle Black T-Plates Chrome Top - Made in USA '47

6SN7GT SYLVANIA Metal Base Tall Bottle Black T-Plates Chrome Top - Made in USA '47

HK$1,636.00 HKD
HK$1,636.00 HKD
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6SN7GT SYLVANIA Metal Base Tall Bottle Black T‑Plates Chrome Top - Made in USA '47

AMPLITREX Tested – 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: STRONG

Tube

  • Section 1: Gm = 1900 ; Ia = 7.2 mA
  • Section 2: Gm = 2100 ; Ia = 7.0 mA

Additional Tests:

  • Microphonics and noise: Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in 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 instrumental applications.
  • Emission: Strong – Strong and steady emission, suitable for any application.
  • Shorts / Gas: none

Description

Rare US-made 6SN7GT Sylvania, manufactured in the 52nd week of 1947 and featuring the prestigious metal base, Tall Bottle, Black T‑Plates, and Chrome Top configuration. An instantly recognizable construction, belonging to the early Sylvania productions and highly sought after for its historical interest, build quality, and reputation in audio applications.

The code 752 identifies a Sylvania production from the 52nd week of 1947. The green markings are excellently preserved and allow for full appreciation of the tube's original aesthetics, including the distinctive metal base with the classic Sylvania logo.

The tube has been carefully measured with an Amplitrex AT‑1000. The two sections recorded Gm 1900 / Ia 7.2 mA and Gm 2100 / Ia 7.0 mA respectively, confirming strong and steady emission. The plate currents are very close, and the transconductance maintains good overall consistency, offering very good balance for a vintage tube of this era.

The test also confirmed low noise and microphonics, as well as an absence of gas or shorts. It is therefore recommended for hi-fi preamplifiers, headphone amplifiers, driver stages, and guitar amplifiers, even in the most sensitive audio positions. The good alignment of the sections also allows for its use as a phase inverter in applications that do not require absolute symmetry.

In terms of sound, early 6SN7GT Sylvania tubes with T‑Plates are appreciated for an open, fast, and natural presentation, with a well-focused midrange, detailed highs, and articulated, controlled low frequencies. The reproduction maintains notable liveliness without sacrificing musicality, favoring definition, instrument separation, and a wide, organized soundstage.

An exceptional offering for those desiring an authentic 1947 Sylvania in the rare Metal Base version, with Tall Bottle, Black T‑Plates, and Chrome Top: a cosmetically well-preserved specimen, carefully tested and ready to enhance quality audio equipment.

Condition

  • Condition: Vintage tube - Tested and perfectly functional. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational
  • Cosmetic condition: Excellent – Markings excellently preserved, minimal signs of aging. See photos for details.
  • Manufacturing code: Manufacturer Sylvania Electric Products Inc., Emporium, Pa. - 752 → 7 (from three digits) → 1947 - 52 → 52nd week of the year

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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