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MULLARD

ECC88 / 6DJ8 MULLARD Blackburn Large Halo Getter - Matched Pair - GA1 B1F - AMPLITREX Tested - Made in Great Britain '50s

ECC88 / 6DJ8 MULLARD Blackburn Large Halo Getter - Matched Pair - GA1 B1F - AMPLITREX Tested - Made in Great Britain '50s

€459,00 EUR
€459,00 EUR
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ECC88 / 6DJ8 MULLARD Blackburn Large Halo Getter - Matched Pair - GA1 B1F - AMPLITREX Tested - Made in Great Britain '50s

Description:

This pair of ECC88 / 6DJ8 MULLARD comes from the historic Blackburn factory (UK) and belongs to the original production of the 50s, identified by the manufacturing code GA1 B1F , identical on both specimens.

The presence of the Large Halo Getter and the typical first generation Blackburn internal structure make this pair particularly sought after by enthusiasts of authentic pre-Philips rebranding Mullard productions.

The aesthetic condition is excellent, with well-preserved silkscreens and intact internal structure. These are used tubes, selected and tested on the Amplitrex AT-1000 , with stable and consistent electrical results.

A true original English production, not a reprint, not a modern selection.

Stable output, regular behavior, no anomalies detected.

The matching between the two valves is correct for hi-fi use, with identical production and code.

Sound Character

Mullard Blackburn '50s are known for their rich, harmonically dense, and natural tone.

Bass: full but controlled, with excellent structure on the fundamentals.

Mids: the real strong point — warm, textured, three-dimensional, with extremely realistic vocal reproduction.

Highs: soft and refined, never aggressive, with a fine, silky texture.

Dynamics: fluid, musical, with clearly perceptible micro-contrast.

Soundstage: deep and enveloping, with excellent central focus.

It is a valve that favors timbral coherence and naturalness over artificial brilliance.

🎧 Use in Hi-Fi Amplifiers

Particularly suitable for:

  • Line and phono preamplifiers
  • Quality driver stages
  • Tube DACs
  • OTL and hybrid amplifications

Perfect for those looking for an authentic musical presentation, with a classic British feel.

🎸 Use in Music Applications

Interesting in instrument circuits and contexts where a softer and more progressive response is appreciated, with natural compression.

🎯 Note for audiophiles and technicians

    The Mullard Blackburn Large Halo productions of the 1950s represent one of the most iconic expressions of the original British ECC88.

    This pair, with identical code GA1 B1F , retains production coherence and distinctive sonic character.

    This is not a NOS selection, but an authentic and stable pair, with solid and musically engaging performance — ideal for those who want to enter the world of vintage Mullards with a genuine and properly tested example.

    Test Results

    Tested on AMPLITREX AT-1000 Tube Tester

    Voltage Test: Va = 90V ; Vg = -1.2V
    Average 100%:     Gm = 12.5 ; Ia = 15.0 mA
    TEST RESULT:     STRONG

    Valve 1:

    • Section 1: Gm = 11.44 ; Ia = 13.8 mA
    • Section 2: Gm = 11.00 ; Ia = 12.3 mA

    Valve 2:

    • Section 1: Gm = 10.20 ; Ia = 10.0 mA
    • Section 2: Gm = 10.00 ; Ia = 10.3 mA

    Additional Tests Performed:
    • Microphonics: Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.
    • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
    • Short circuits and GAS: Absent.

    Conditions:

    • Condition: Vintage tubes - Tested and in perfect working order. Shipped 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: GA1 B1F → GA x indicates an ECC88 with the sequential progression of x, where the increment of x indicates the production changes - B1F B → Mullard, Blackburn - 1 (out of three digits) → 1951 - F → June

    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.

    • 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.