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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

HK$840.00 HKD
HK$840.00 HKD
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12AX7 / ECC83 Baldwin by SYLVANIA Gray Plates Halo Getter Matched Pair Made in USA 1959

Matched Pair – AMPLITREX Tested – Low Noise & Microphonics – Vintage American Sylvania Production

General Description

This matched pair of 12AX7 / ECC83 Baldwin by Sylvania, produced in the United States in 1959, represents one of the most highly regarded American interpretations of the famous ECC83.

Valves branded Baldwin were intended for high-end electronic organs of the era and were selected by manufacturers who demanded reliability, quiet operation, and long service life. Behind the Baldwin brand, in this case, we find the renowned SYLVANIA Made in USA production, recognizable by its construction with Gray Plates and Halo Getter, a configuration particularly appreciated by enthusiasts for its tonal balance and natural musicality.

Sylvania Gray Plates from the late 1950s are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.

This pair has been carefully selected and verified using AMPLITREX AT-1000, showing STRONG performance on both valves.

From an aesthetic standpoint, the valves are in good condition, with well-preserved internal structure and still legible silkscreen printing.

Sonic Characteristics

Baldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, defined by balance, musicality, and excellent intelligibility.

Bass

The bass is well-controlled and defined, with good presence and articulation. It provides solidity to the low-end without weighing down the musical message.

Midrange

The midrange is probably the strong point of this production. Vocals appear natural, rich in harmonics, and well-focused in the soundstage.

Treble

The treble is open and detailed, but never aggressive. Environmental information and finer nuances are reproduced with naturalness and fluidity.

Dynamics

The dynamics are quick and lively, with an engaging musical response that enhances both small ensembles and large orchestras.

Soundstage

The soundstage is wide and well-organized, with good depth and correct placement of instruments.

🎧 Use in Hi-Fi Amplifiers

This matched pair is particularly suitable for:

  • Tube preamplifiers
  • Integrated hi-fi amplifiers
  • MM and MC phono stages
  • Tube DACs
  • Buffers and line stages
  • Restoration of vintage American electronics

The Low Noise & Microphonics selection also makes it suitable for the most sensitive positions in the circuit.

🎸 Use in Musical Applications

Baldwin by Sylvania Gray Plates are also highly appreciated by musicians due to their ability to offer:

  • Excellent note definition
  • Rich and musical mids
  • Natural dynamic response
  • Open but not aggressive sound

Particularly interesting for guitar amplifiers that require clarity, articulation, and vintage American musicality.

🎯 Note for Audiophiles and Collectors

Authentic Sylvania Gray Plates from the late 1950s, especially when available with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those seeking the classic vintage American sound.

The combination of:

  • SYLVANIA Made in USA production
  • Gray Plates
  • Halo Getter
  • Matched Pair
  • Low Noise & Microphonics
  • STRONG performance on both valves

makes this pair ideal for quality hi-fi listening as well as for collectors and enthusiasts of American tube electronics.

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: STRONG

Valve #1:

  • Section 1: Gm = 1300 ; Ia = 0.8 mA
  • Section 2: Gm = 1300 ; Ia = 0.8 mA

Valve #2:

  • Section 1: Gm = 1300 ; Ia = 0.7 mA
  • Section 2: Gm = 1300 ; Ia = 0.7 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1 positions.
  • Balance: Very good. The sections are consistent and well-aligned, making the valve suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Emission Quality: Good Emission – Good and regular emission, suitable for any application
  • Shorts and GAS: Absent.

Condition:

  • Condition: Vintage Valves - Tested and perfectly working, in electrical condition like NOS. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Aesthetic Condition: Very Good – Legible markings with slight signs of age. See photos for details.
  • Manufacturing Code: 312 913 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 126 → 9 ( three digits ) → 1959 - 13 → 13th week of the year

Discover 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.