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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

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

Tube #2:

  • Section 1: Gm = 2500 ; Ia = 8.4 mA
  • Section 2: Gm = 2500 ; Ia = 7.8 mA

Tube #8:

  • Section 1: Gm = 2500 ; Ia = 8.2 mA
  • Section 2: Gm = 2500 ; Ia = 8.6 mA
Additional tests performed:
  • Burn-in / Stability Test: 48h – OK
  • Microphonics: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: None.

Description:

An important pair of 6SN7GTB Baldwin tubes produced by Sylvania, made in the United States in 1961 and originating from the same production batch. Both units feature the code 312 113: the EIA code 312 identifies Sylvania Electric Products Inc. of Emporium, Pennsylvania, while 113 indicates the 13th week of 1961. The Baldwin branding documents the OEM destination for the historic American organ and musical equipment manufacturer.

These two tubes form an Amplitrex Matched pair of remarkable consistency. All four sections measure exactly 2500 µmhos, offering perfect transconductance matching between the two units. The plate currents are also very close, ranging between 7.8 and 8.6 mA, with average values of 8.1 and 8.4 mA: a minimal deviation that confirms the pair's excellent operating uniformity.

The internal balance is equally convincing. Tube #2 features sections of 2500/2500 µmhos and 8.4/7.8 mA, while Tube #8 measures 2500/2500 µmhos and 8.2/8.6 mA. This consistency makes the pair particularly suitable for stereo circuits, headphone amplifiers, preamplifiers, and drivers, as well as for applications requiring good symmetry between sections.

During testing, both tubes showed strong, steady, and stable emission, without fluctuations, shorts, or gas presence. Their low microphonics allow for use in the most sensitive audio stages of compatible equipment, including input and V1 positions in musical instrument amplifiers.

In terms of sound, Sylvania-produced 6SN7GTBs are appreciated for an open, dynamic, and natural presentation, with a transparent midrange, solid and controlled low frequencies, and defined highs that are never harsh. The exceptional electrical uniformity of this pair further promotes coherent reproduction between channels, a stable soundstage, and excellent overall balance.

A proposal of particular interest for those seeking a true American matched pair from the same batch, with identical manufacturing codes, perfectly matched transconductance, low microphonics, and excellent cosmetic condition: two authentic Baldwins produced by Sylvania in 1961, individually tested and ready for use.

Conditions:

  • Condition: Vintage tubes - Tested and in perfect working order. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Labels well-preserved, minimal signs of aging. See photos for details.
  • Manufacturing Code: 312 113 - 312 → Sylvania Electric Products Inc., Emporium, Pa. - 113 → 1 (out of three digits) → 1961 - 13 → 13th week of the year


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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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