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PHILCO

6SN7 GTB NOS NIB Philco by Sylvania – Black Plates Chrome Top Tested Tube USA 1957

6SN7 GTB NOS NIB Philco by Sylvania – Black Plates Chrome Top Tested Tube USA 1957

€42,44 EUR
€42,44 EUR
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6SN7 GTB NOS NIB PHILCO Black Plates Chrome Top Tested Tube Made in USA '57

Description:

The 6SN7 GTB PHILCO by Sylvania Black Plates , with Chrome Top , produced in the United States in 1957 , represent one of the best choices for those looking for a balanced, musical and detailed sound reproduction . Made by Sylvania for PHILCO , these tubes combine the typical transparency and articulation of Sylvania with a slightly warmer and more harmonious tone , making them perfect for hi-fi preamplifiers and vintage tube amplifiers .

  • Bass : Well defined and controlled , with a deep but never intrusive low range. Excellent articulation allows for clean and precise reproduction, without unwanted bloating.
  • Mids : Natural, detailed and slightly warm , with exceptional instrument separation. Voices are enveloping and realistic , while acoustic instruments enjoy three-dimensional clarity and presence .
  • Highs : Extended and refined , with a sweet and silky performance, free from harshness or fatigue. The detail is extraordinary but always musical, ensuring a transparent and balanced sound performance.
  • Dynamics : Responsive and fluid , with rapid and natural transient management, ensuring an engaging and articulated sound, capable of delivering both the most delicate nuances and the most energetic passages with precision and naturalness.
  • Soundstage : Wide and airy , with excellent separation between instruments and a three-dimensional rendering that gives depth to the soundstage.

Thanks to their robust construction, with Black Plates and Chrome Top , these 6SN7 GTB PHILCO by Sylvania offer excellent operational stability and reduced microphony , making them ideal for demanding audiophiles and high-end hi-fi systems . Their warm, detailed and harmonically rich sound makes them an excellent choice for those who want transparent and musical reproduction.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -8V
  • Average 100%: Gm = 2600 ; Ia = 9 mA
  • Test Result: VERY STRONG

Valve :

  • Section 1: Gm = 2600 ; Ia = 8.2 mA
  • Section 2: Gm = 2400 ; Ia = 7.6 mA
Additional Tests Performed:
  • Microphonics: Standard – Tested and approved for use in hi-fi systems and guitar amplifiers.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.
  • Functionality: Fully functional.
  • Aesthetic condition: Excellent – Perfectly preserved writing, minimal signs of wear. See photos.
  • Manufacturing Code: 312 - 572? - Manufactured by Sylvania in 1957

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.

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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.