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SYLVANIA

12AU7 ECC82 NOS Baldwin Sylvania Matched Quad Long Gray Plates Tubes USA 1954

12AU7 ECC82 NOS Baldwin Sylvania Matched Quad Long Gray Plates Tubes USA 1954

$132.00 AUD
$132.00 AUD
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12AU7 A ( ECC82 ) NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Matched Quad Same Data Codes Tubes Made in USA '54

Description:

The 12AU7A Baldwin by SYLVANIA , made in 1954 in the USA for select use in Baldwin organs , is a high-end valve, built to exacting standards and selected for stability, musicality and tonal accuracy .
In this version with long grey plates , halo getters and identical production codes , the matched quartet stands out for a round, fluid and three-dimensional sound, ideal for tube preamps, tube DACs, stereo driver stages and OTL amplifiers.

Bass : dry, deep, and well-articulated. The low register is tight and stable, with an immediate response that gives solidity to the musical message without introducing bloat. The grain is fine, with a clean rendition even in complex passages.

Mids : Full, warm, and coherent. Voices emerge naturally, maintaining a rounded, never fatiguing timbre. Acoustic instruments are rendered with great realism, thanks to a fluid, well-centered harmonic texture.

Highs : Airy, bright, and velvety. The highs are open yet controlled, with elegant detail that enriches the soundstage without ever becoming harsh. The clarity is refined, suitable even for prolonged listening.

Dynamics : progressive, balanced, and responsive. The transient response is fluid and musical, with highly detailed micro-variations. The long-plate structure promotes natural reproduction even in the most delicate passages.

Soundstage : wide, three-dimensional, and coherent. The soundstage unfolds with great realism, thanks to the stability and symmetry provided by the matched quartet with identical codes . The stereo image is focused, with well-balanced depth and width.

The 12AU7A Baldwin by SYLVANIA – Long Gray Plates – Halo Getter – Matched Quad – Made in USA '54 , is a tube with a musical soul, perfect for those looking for transparency, tonal balance and natural harmonic output , without compromising between detail and musicality.

🎧 Use in Headphone Amplifiers and Hi-Fi Driver Stages

Excellent in OTL amplifiers, tube preamps or tube DACs, this tube delivers a coherent, refined and balanced voice, ideal for use with reference headphones such as the Sennheiser HD800S , Focal Clear , Audeze LCD-X or ZMF Atrium . Coherence between channels is enhanced by the selection of identical codes , making it perfect for balanced or dual mono configurations.

🎸 Use in Guitar and Bass Amplifiers

This tube also lends itself well to musical use in vintage or boutique tube amplifiers , particularly as a stage driver or phase inverter . The tone is rich yet controlled , with a gradual dynamic response and natural harmonic saturation, suitable for refined sounds and recording environments.

🎯 Note for audiophiles
A tube that combines construction refinement, natural musicality, and tonal transparency , perfect for systems where detail must coexist with smoothness, and operational symmetry is a fundamental requirement. The matched quartet with halo getters and long plates is one of the most sought-after configurations of American production from the 1950s.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V, Vg = -8.5V
  • Average 100%: Gm = 2200 ; Ia = 10.5 mA
  • Test Result: VERY STRONG

Valve 1:

  • Section 1: Gm = 2300 ; Ia = 10.4 mA
  • Section 2: Gm = 2400 ; Ia = 10.8 mA

Valve 2:

  • Section 1: Gm = 2400 ; Ia = 10.6 mA
  • Section 2: Gm = 2300 ; Ia = 10.4 mA

Valve 3:

  • Section 1: Gm = 2400 ; Ia = 10.8 mA
  • Section 2: Gm = 2300 ; Ia = 10.6 mA

Valve 4:

  • Section 1: Gm = 2350 ; Ia = 10.8 mA
  • Section 2: Gm = 2300 ; Ia = 10.6 mA

Additional Tests Performed:

  • Microphonics: Low – Tested and rated for use in hi-fi systems and guitar amplifiers.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - New Old Stock - Tested and in perfect working order. Comes in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic condition: Excellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.
  • Manufacturing Code: 312 439 - produced in the 39th week of 1954

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.

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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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