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SYLVANIA

12AX7 ECC83 Baldwin by SYLVANIA – Matched Pair – Long Gray Plates Halo Getter USA 1959

12AX7 ECC83 Baldwin by SYLVANIA – Matched Pair – Long Gray Plates Halo Getter USA 1959

€89,90 EUR
€89,90 EUR
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12AX7 ( ECC83 ) Baldwin by SYLVANIA Matched Pair Long Gray Plates Halo Getter Tubes Made in USA '59

Description:

The 12AX7 Baldwin by Sylvania , manufactured in the USA in 1959 , is a Baldwin organ valve selected by Sylvania with long gray plates and ring getters , built to exacting selection standards. This matched pair represents a rare combination of natural musicality, quiet operation, and tonal consistency , ideal for symmetrical stereo phono applications or high-precision multiple-channel configurations.

  • Bass : Smooth and well-controlled, with a balanced presence free of bloat. They provide a solid and coherent foundation for the soundstage, with excellent articulation in the lower registers.
  • Mids : Warm, slightly euphonic, and rich in harmonics. Vocals and acoustic instruments emerge naturally and deeply, always maintaining a consistent timbre across the tubes in the group.
  • Highs : Airy and velvety, free from harshness. Even on highly analytical systems, the high range retains brilliance and musicality without tiring the listener.
  • Dynamics : Smooth, musical, and well-balanced. The quartet delivers a cohesive and natural response, with well-managed microtransients and a linear, reliable behavior from each tube.
  • Soundstage : Wide, three-dimensional, and stable. Thanks to accurate matching, the soundstage is deeply coherent, with excellent separation between the sound planes and a sense of well-distributed space.

This matched pair of Sylvania 12AX7s made for Baldwin is an excellent choice for those seeking a refined, musical, and smooth tonal presentation , ideal for preamplifiers, dual-mono stereo amplifiers, balanced DACs, or high-end hi-fi systems where symmetry and precision between channels make the difference.

🎧 Use in Hi-Fi Amplifiers

Ideal for high-end tube hi-fi preamps, integrated amplifiers, and phono stages, these 12AX7s deliver refined musicality and tonal consistency . Perfect for those seeking a classic 1950s American sound with maximum naturalness.

🎸 Use in Guitar and Bass Amplifiers

Also excellent for vintage guitar amplifiers (Fender, Ampeg, Gibson, etc.), where they provide clarity, generous headroom, and musical harmonic distortion.

🔊 Ideal for musicians looking for:

  • Timbral uniformity and consistent response across all channels
  • Clean three-dimensional, warm and well separated
  • A smooth and harmonic overdrive, ideal for jazz, blues and vintage rock
  • Low microphonics, perfect even in studio racks or professional live systems

🎯 Note for Audiophiles and Technicians

This 1959 Baldwin by Sylvania matched pair is a “VERY STRONG” test-selected set and is perfect for both premium hi-fi listening and use in professional equipment and demanding musical instruments. A premium choice for collectors and enthusiasts.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 1.2 mA
  • Test Result: VERY STRONG

Valve #6:

  • Section 1: Gm = 1500 ; Ia = 1.1 mA
  • Section 2: Gm = 1400 ; Ia = 0.9 mA

Valve #7:

  • Section 1: Gm = 1500 ; Ia = 0.9 mA
  • Section 2: Gm = 1500 ; Ia = 1.0 mA
Additional Tests Performed:
  • Microphonics: Standard. Tested and approved for use in hi-fi and guitar amplifiers. Not recommended for the V1 position in high-sensitivity guitar amplifiers.
  • Balance: The sections show consistent and well-aligned values.
  • 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.
  • Aesthetic condition: Very good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.
  • Manufacturing Code: 312 913 → 312 indicates the manufacturer, i.e. Sylvania Electric Products Inc., Emporium, Pa. - 913 → 9 (out of three digits) → 1959 - 13 → 13th week of the year

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
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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.