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SYLVANIA

12AX7 / ECC83 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter USA '61

12AX7 / ECC83 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter USA '61

37.300 ISK
37.300 ISK
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12AX7 / ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Matched Quad Made in USA 1961

Matched Quad – AMPLITREX Tested – Vintage American Sylvania Production

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 #13:
  • Section 1: Gm = 1800 ; Ia = 1.3 mA
  • Section 2: Gm = 1800 ; Ia = 1.2 mA
Tube #9:
  • Section 1: Gm = 1900 ; Ia = 1.5 mA
  • Section 2: Gm = 1800 ; Ia = 1.3 mA
Tube #11:
  • Section 1: Gm = 1800 ; Ia = 1.3 mA
  • Section 2: Gm = 1900 ; Ia = 1.4 mA
Tube #19
  • Section 1: Gm = 1900 ; Ia = 1.4 mA
  • Section 2: Gm = 1800 ; Ia = 1.2 mA

Additional Tests Performed

  • Burn-in / Stability Test: 48h – OK
  • Microphonics: Standard. Tested and suitable for use in hi-fi equipment and guitar amplifiers. Recommended for V2, V3, and V4 positions, as drivers or in less critical stages. For V1 and for high-gain positions particularly sensitive to microphonics, we recommend a tube with low microphonics selection.
  • Balance: The sections are consistent and well-aligned, making the tubes also suitable for use as phase inverters in hi-fi and instrumental applications.
  • Emission Quality: Excellent – very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Description

Matched quad of 12AX7 / ECC83 NOS Baldwin by Sylvania, Made in USA, 1961 production, selected for compatible hi-fi and musical applications where channel consistency, good operational stability, and authentic vintage American sound character are required.

Baldwin-branded tubes were intended for high-end electronic organs of the era, where reliability, long lifespan, and operational uniformity were fundamental requirements. In this case, production is attributable to Sylvania Made in USA, featuring Gray Plates and Halo Getter construction, a configuration appreciated for its tonal balance, openness, and natural musicality.

The tubes are in NOS – New Old Stock condition, with well-preserved internal structure, very strong electrical values, and clearly legible lettering. See photos for aesthetic details.

The quad has been carefully tested and selected using an Amplitrex AT-1000 Tube Tester as a Matched Quad, with a VERY STRONG result on all tubes. The microphonics level is Standard: the tubes are tested and suitable for use in hi-fi equipment and guitar amplifiers, particularly recommended for V2, V3, and V4 positions, as drivers or in less critical stages. For V1 and for high-gain positions particularly sensitive to microphonics, we recommend a specific Low Noise & Microphonics selection instead.

Sonically, they offer a balanced, open, and engaging performance, with controlled bass, natural and rich mids, clean and detailed but not aggressive highs. The soundstage is orderly and stable, with good channel coherence and the typical musical character of early 1960s American Sylvania production.

Suitable for tube preamplifiers, hi-fi integrated amplifiers, driver stages, tube DACs, buffers, line stages, vintage restorations, and instrument amplifiers compatible with 12AX7 / ECC83.

A truly selected, tested, and matched NOS Sylvania/Baldwin quad from Vacuum Tubes Treasures, ideal for those seeking four strong, musical, and consistent American 12AX7 / ECC83 tubes, with the reliability and charm of vintage USA production.

Condition:

  • Condition: NOS - New Old Stock - Tested and functional - Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Aesthetic condition: Excellent – Lettering perfectly preserved, minimal signs of age. See photos for details.
  • Manufacturing Code: 312 152 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 152 → 1 (out of three digits) → 1961 - 52 → 52nd 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
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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.