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MULLARD

12AX7 / ECC83 NOS MULLARD Blackburn 1958 – Long Gray Plates Goalpost Getter – Matched Pair

12AX7 / ECC83 NOS MULLARD Blackburn 1958 – Long Gray Plates Goalpost Getter – Matched Pair

$437.00 USD
$437.00 USD
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12AX7 / ECC83 NOS MULLARD – Blackburn (Great Britain) 1958

Long Gray Plates – Goalpost / Dual Post Getter – Matched Pair

Description:

This matched pair of NOS MULLARD 12AX7 / ECC83s , produced in the historic Blackburn factory (Great Britain) in 1958 , represents one of the rarest, earliest and most sought-after versions of the entire Mullard production.

The construction with long gray plates and goalpost / dual post getter identifies a very early technical configuration , today particularly appreciated for its construction quality, mechanical stability and sonic refinement. It is a tube that fully embodies the golden age of Mullard, when the absolute priority was musical performance and reliability over time.

The pair is NOS , selected as a Matched Pair , and features low noise and limited microphonics , making it suitable even for sensitive positions in the circuit.

Sound Characteristics

Bass: Deep, rounded, and perfectly controlled. The low end is authoritative yet elegant, with a solid structure that supports the music without weighing it down.

Mids: The heart of this version. Rich, textured, and three-dimensional, with extremely natural voicings and a deep harmonic texture, typical of first-generation Mullards.

Highs: Silky, refined, and well-extended. The highs are sweet and never aggressive, with a naturalness that favors long, highly engaging listening sessions.

Dynamics: Fluid, expressive, and very natural. Microdynamics are excellent, with a responsive yet composed transient response.

Soundstage: Wide, deep, and beautifully layered. The soundstage is three-dimensional and stable, with realistic instrument placement and excellent separation.

🎧 Use in Hi-Fi Amplifiers

Ideal for:

  • high-level input and pre-amplification stages,
  • high-end hi-fi preamplifiers and integrated amplifiers,
  • systems that seek tonal refinement, naturalness and silence .

Particularly suitable for jazz, vocal, classical and acoustic music.

🎸 Use in Music Applications

Also excellent in:

  • vintage and boutique guitar amplifiers,
  • V1 position , thanks to low noise & low microphonics .

They offer rich harmonics, great tonal depth and an authentically British character of their origins.

🎯 Note for audiophiles and technicians

This 12AX7 / ECC83 NOS MULLARD Blackburn 1958 – Long Gray Plates – Goalpost / Dual Post Getter – Matched Pair represents:

  • a very early Mullard production of Blackburn ,
  • one of the rarest and most musically appreciated configurations,
  • NOS selection with low noise and contained microphonics,
  • first-rate sound, historical and collectible value .

A pair intended for reference systems and demanding collectors , for those who desire the original Mullard sound , rich, natural and deeply emotional, in the full Vacuum Tubes Treasures style.

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 #1:

  • Section 1: Gm = 1500 ; Ia = 1.2 mA
  • Section 2: Gm = 1600 ; Ia = 1.2 mA

Valve #2:

  • Section 1: Gm = 1500 ; Ia = 1.2 mA
  • Section 2: Gm = 1500 ; Ia = 1.3 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • Noise: Low and well-controlled. Silent operation in hi-fi and music amplifiers in the intended positions.
  • Balance: The sections are coherent and well aligned, making the valve also suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - New Old Stock - Tested and working - Supplied 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:

  • f92 B8K→ f9x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes - B8K B → Mullard, Blackburn - 8 (out of three digits) → 1958 - K → November
  • f92 B8L→ f9x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes - B8K B → Mullard, Blackburn - 8 (over three figures) → 1958 - L → December

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
www.vtt.store | www.vacuumtubestreasures.com
📧 info@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.