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SYLVANIA

12AX7 / ECC83 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '61

12AX7 / ECC83 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Tested Tube Made in USA '61

1.729,00 CZK
1.729,00 CZK
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12AX7 / ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Made in USA 1964

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

General Description

This 12AX7 / ECC83 Baldwin by Sylvania, produced in the United States in 1964, represents one of the most appreciated American interpretations of the famous ECC83.

Tubes branded Baldwin were intended for high-end electronic organs of the time and were selected by manufacturers requiring 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 the construction with Gray Plates and Halo Getter, a configuration particularly appreciated by enthusiasts for its tonal balance and natural musicality.

Early 1960s Sylvania Gray Plates are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.

This tube has been carefully verified using AMPLITREX AT-1000, resulting in VERY STRONG performance, superior to nominal reference values.

Aesthetically, it is in excellent condition, with a well-preserved internal structure and still legible silkscreen printing.

Sonic Characteristics

Baldwin by Sylvania Gray Plates possess the typical high-quality American sound character, distinguished 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 range without weighing down the musical message.

Mids

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

Highs

The highs are 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 tube is particularly suitable for:

  • Tube preamplifiers
  • Integrated hi-fi amplifiers
  • MM and MC phono stages
  • Tube DACs
  • Buffers and line stages
  • Restorations 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 early 1960s Sylvania Gray Plates, especially when available with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those who desire the classic vintage American sound.

The combination of:

  • SYLVANIA Made in USA production
  • Gray Plates
  • Halo Getter
  • Low Noise & Microphonics
  • VERY STRONG performance

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

Test Results:

Tube 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

Tube #4:

  • Section 1: Gm = 1900 ; Ia = 1.3 mA
  • Section 2: Gm = 1600 ; Ia = 1.1 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: Good. The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.  
  • Functionality: Perfectly operational.
  • Aesthetic Condition: Excellent – Markings optimally preserved, minimal signs of age. See photos for details.
  • Manufacturing Code: 312 139 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 139 → 1 (three digits) → 1961 - 39 → 39th 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.

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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.

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