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SYLVANIA

6SN7 GTB Baldwin by SYLVANIA Matched Pair Black Plates Tubes Same Codes Made in USA '61

6SN7 GTB Baldwin by SYLVANIA Matched Pair Black Plates Tubes Same Codes Made in USA '61

€79,90 EUR
€79,90 EUR
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6SN7GTB Baldwin by SYLVANIA – Matched Pair – Same Data Codes – Made in USA 1961

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics – Vintage American Sylvania Production

Matched pair of 6SN7GTB Baldwin by Sylvania, Made in USA 1961 production, selected for compatible hi-fi and musical applications requiring stability, channel consistency, and low noise.

The tubes come from the same batch and have same data codes, an important detail for manufacturing and aesthetic uniformity. The construction is typical Sylvania of the era, with black plates, top halo getter, top getter flashing, black base and Baldwin green lettering still clearly legible. General aesthetic conditions are excellent, with minimal signs consistent with age and vintage use. See photos for details.

The pair has been tested on Amplitrex AT-1000 Tube Tester with a result of VERY STRONG and has been selected as Low Noise & Microphonics. The actual matching between the two tubes makes it a solid choice for systems where balance, quietness, and operational reliability are important.

Sonically, it offers a full, stable, and musically balanced sound, with controlled bass, natural mids, clean highs, and an organized soundstage. The character is typical of vintage American Sylvania production: solid, fluid, and well-defined.

Suitable for preamplifiers, driver stages, phase splitters, and circuits compatible with 6SN7 / 6SN7GTB.

A truly selected, tested, and matched vintage American pair from Vacuum Tubes Treasures, ideal for those seeking reliable performance, low noise, and authentic Sylvania sonic character.

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 #16:

  • Section 1: Gm = 2500 ; Ia = 8.4 mA
  • Section 2: Gm = 2600 ; Ia = 9.8 mA

Tube #12:

  • Section 1: Gm = 2600 ; Ia = 9.0 mA
  • Section 2: Gm = 2600 ; Ia = 9.2 mA
Additional tests performed:
  • Microphonics: Low. Tested and compliant for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Conditions:

  • Condition: Vintage Tubes - Tested and perfectly working. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Markings excellently preserved, minimal signs of age. See photos for details.
  • Manufacturing Code: 312 113 - 312 → Sylvania Electric Products Inc., Emporium, Pa. - 113 → 1 ( three digits ) → 1961 - 13 → 13th 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.

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.