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SYLVANIA

6L6G SYLVANIA Smoked Glass Square Bottom Getter - Pair - Same Factory Code 052 - Amplitrex Tested - STRONG

6L6G SYLVANIA Smoked Glass Square Bottom Getter - Pair - Same Factory Code 052 - Amplitrex Tested - STRONG

$249.00 AUD
$249.00 AUD
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6L6G SYLVANIA – Smoked Glass – Square Bottom Getter – Pair – Same Factory Code 052 – AMPLITREX Tested – Test STRONG

General Description

This pair of 6L6G SYLVANIA tubes , made in the United States, represents one of the most fascinating interpretations of the historic American 6L6 family. The classic G-style “coke bottle” bulb with smoked glass is typical of high-quality vintage production and gives these tubes a strong technical and collectible value.

The internal structure with square bottom getter and robust plates is characteristic of Sylvania productions of the time, known for their construction solidity and operational stability.

Both tubes bear the same manufacturing code 052 , indicating that they come from the same production batch. They have been tested in our laboratory on AMPLITREX AT-1000 , with STRONG results and stable electrical behavior.

Sound Characteristics

Bass: Deep and well-structured. The low range is full and authoritative, with good articulation and natural rhythm support.

Mids: Rich and three-dimensional. Vocals are warm and present, while acoustic instruments and guitars maintain great naturalness and harmonic texture.

Highs: Smooth and refined. The highs are extended but still controlled, with a fine grain that favors prolonged listening.

Dynamics: Smooth and progressive. Transient response is natural and musical, with a coherent, non-rigid output.

Soundstage: Wide and well-layered soundstage, with good depth and natural separation of sound planes.

🎧 Use in Hi-Fi Amplifiers

Ideal for amplifiers designed for 6L6G / 6L6GA / 6L6GB / 5881 , where you are looking for:

  • musicality and naturalness of timbre
  • rich and engaging media
  • typically American sound character

The fact that they come from the same production batch contributes to good operational consistency between the two specimens.

🎸 Use in Music Applications

Also highly prized in vintage and boutique guitar amps , where smoked glass 6L6Gs are known for:

  • warm and harmonically complex mids
  • smooth and musical dynamic response
  • authentic vintage sound character

🎯 Note for audiophiles and technicians

  • SYLVANIA Production – Made in USA
  • Smoked Glass Coke Bottle
  • Square Bottom Getter
  • Same Factory Code 052
  • AMPLITREX Tested
  • STRONG Test

A pair with great historical and sonic charm, representative of the classic American 6L6Gs , capable of offering musicality, reliability and vintage character in full Vacuum Tubes Treasures style.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 350V; Vg2 = 250; Vg = -18V
  • Average 100%: Gm = 5.2 ; Ia = 54 mA
  • Test result: STRONG

Valve #1: Gm = 4.2 ; Ia = 47.7 mA

Valve #2: Gm = 4.2 ; Ia = 40.0 mA

Additional Tests Performed:
  • Microphonics: Standard. Tested and approved for use in hi-fi and guitar amplifiers.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic condition: Excellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.
  • Manufacturing Code: 052, generally interpreted as late 1950 production (52nd week) according to the RMA/EIA open coding system used by Sylvania.

Find out why our valves 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
www.vtt.store | www.vacuumtubestreasures.com
📧 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.

  • ATTENTION PLEASE

    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.