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MULLARD

12AX7 / ECC83 NOS MULLARD – Blackburn 1959 – Matched Pair – Short Gray Plates – Halo Getter – Same Data Code – AMPLITREX Tested

12AX7 / ECC83 NOS MULLARD – Blackburn 1959 – Matched Pair – Short Gray Plates – Halo Getter – Same Data Code – AMPLITREX Tested

128.900 HUF
128.900 HUF
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12AX7 / ECC83 NOS MULLARD – Blackburn 1959 – Short Gray Plates – Halo Getter – Matched Pair – Same Data Code I61 B9K – AMPLITREX Tested

Description:

This matched pair of NOS Mullard 12AX7/ECC83s , produced in the historic Blackburn (Great Britain) factory in 1959 , represents one of the most appreciated configurations of the British Mullard production.

The valves have the classic internal structure:

  • Short Gray Plates
  • Halo Getter
  • Mullard Blackburn production
  • identical data code: I61 B9K

The I61 code identifies the famous Mullard structure for ECC83 with short plates , while B9K confirms the Blackburn 1959 production, one of the most sought-after periods by enthusiasts.

The specimens are NOS (New Old Stock) and are presented in showcase aesthetic condition , with perfectly preserved silkscreen prints and internal construction.

Both tubes have been thoroughly tested in our laboratory with the AMPLITREX AT-1000 , verifying emission, stability and operating behavior. They also proved to be Low Noise & Microphonics , qualities that make them suitable even for the V1 position in the most sensitive circuits.

Sound Characteristics

Mullard Blackburn ECC83s are renowned for their natural musicality and warm, engaging character, which has made these tubes a favorite among audiophiles and musicians.

Bass: Deep and well-controlled. The low end is full and authoritative, with an excellent balance between body and precision.

Mids: The strong point of the Mullard tradition. Vocals sound rich, three-dimensional, and very natural, while acoustic instruments and harmonics emerge with great presence.

Highs: Sweet and refined. The highs are well-extended yet elegant, with a fine texture that encourages long, relaxed listening.

Dynamics: Very fluid. Dynamic variations are reproduced naturally and seamlessly, always maintaining great musicality.

Soundstage: Wide and stable soundstage, with nice depth and very credible instrument separation.

🎧 Use in Hi-Fi Amplifiers

Mullard Blackburn ECC83s are among the most sought after tubes for:

  • tube preamplifiers
  • phono stages
  • hi-fi amplifier drivers
  • high-end vintage audio equipment

Thanks to the low noise and reduced microphonics , this pair is perfectly suited even for the most critical positions of the circuit , including V1 .

🎸 Use in Music Applications

In the world of musical instrument amplifiers, the 1950s Mullard ECC83s are considered a benchmark.

They offer:

  • rich and musical mediums
  • very expressive dynamic response
  • excellent timbre definition

Features that contribute to a warm, articulate and very musical sound.

🎯 Note for audiophiles and technicians

  • Mullard–Blackburn (Great Britain)
  • Year of production: 1959
  • Structure I61 – Short Gray Plates
  • Halo Getter
  • Identical Data Code: I61 B9K
  • Matched Pair
  • NOS – Showcase condition
  • Low Noise & Microphonics – also suitable for V1
  • AMPLITREX AT-1000 Tested

An authentic 1959 Mullard Blackburn pair , with identical production numbers , built in one of the most iconic factories in vacuum tube history. A combination of build quality, musicality, and historic appeal that continues to make these ECC83s among the most sought-after by vintage audio enthusiasts.

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: STRONG

Valve #1:

  • Section 1: Gm = 1500 ; Ia = 0.9 mA
  • Section 2: Gm = 1800 ; Ia = 1.2 mA

Valve #2:

  • Section 1: Gm = 1500 ; Ia = 0.9 mA
  • Section 2: Gm = 1800 ; Ia = 1.4 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.
  • 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:

  • I61 B9K→ I6x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes - B9K B → Mullard, Blackburn - 8 (over three figures) → 1959 - K → November

Find out why our valves are different →

Condizioni di vendita e sicurezza

Anti-Tamper Security Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal remaining intact, as provided for by the Consumer Code.

Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper for packaging, along with brown ECO-KRAFT adhesive tape, eco-friendly and solvent-free.

Important Notes:
This tube, manufactured according to the standards of its era, is designed to operate in equipment compatible with vintage tubes.
It is recommended to follow standard safety guidelines to avoid malfunctions or damage.

Safety Assurance:
Although not tested according to modern GPSR regulations, this tube was designed to operate safely under the conditions for which it was manufactured.
We recommend using it only with equipment that supports vintage tubes, in order to avoid risks of malfunction or damage.
Technical data note:
In some cases, the technical data provided may be based on datasheets from other manufacturers or on equivalent historical specifications, when a specific official datasheet for the production batch of the listed item is not available.
Electrical characteristics may vary slightly depending on the production batch and manufacturing period, as is typical for thermionic components.

Safety Information:
Warning: Keep out of reach of children.
To be used under adult supervision.
Use the product only with equipment designed for vintage tubes.

Shipping & Returns

Shipping & Returns

Shipping Costs

Shipping costs vary depending on the total amount of the items in the cart and are calculated automatically during the checkout process.
All shipments are fully insured. The courier is automatically selected based on destination, weight, and shipment characteristics.

Shipping Times and Delivery

The indicated delivery times are purely indicative.
Any delays, storage issues, or operational changes made by the carrier (for example during peak periods such as holidays) are not attributable to Vacuum Tubes Treasures.

In such cases, we will nevertheless provide the Customer with all necessary support to open claims or assistance requests with the appointed courier.

International Shipping (Non-EU Countries)

For orders shipped to countries outside the European Union, any customs duties, import taxes, or additional charges are the sole responsibility of the recipient.
Vacuum Tubes Treasures has no control over these costs, which may vary from country to country. Customers are therefore advised to contact their local customs authorities prior to placing an order.

Warranty

All products sold by Vacuum Tubes Treasures are covered by the legal warranty of conformity, in accordance with Italian Legislative Decree No. 206/2005 (Consumer Code) and the Italian Civil Code (Articles 1490 et seq.), under the conditions set out below.

Warranty for Vacuum Tubes

Vacuum tubes, being components subject to wear and of vintage or specialized nature, are covered by a specific warranty of 6 (six) months from the date of delivery.
The warranty covers exclusively proven manufacturing or conformity defects that arise during proper use in accordance with technical specifications.

The warranty does not cover:

  • normal wear and tear,
  • subjective sound preferences,
  • use in incompatible equipment,
  • tampering or improper use.

Right of Withdrawal

Purchases made on the Vacuum Tubes Treasures website are governed by Italian regulations on distance contracts (Legislative Decree No. 206/2005).

Consumers have the right to withdraw from the contract within 14 (fourteen) days from the date of receipt of the goods, without providing any reason.

Conditions for Exercising the Right of Withdrawal

The right of withdrawal may be exercised only if:

  • the product has not been used,
  • the product is returned in its original condition,
  • the tamper-evident security seal is intact and not broken.

📌 Returns are not accepted for reasons related to sound preference, tube rolling, or subjective audio evaluation.
As with a music recording, a vacuum tube cannot be returned simply because its sound does not match personal taste.

Effects of Withdrawal

In the event of a valid withdrawal:

  • all payments received, including standard shipping costs, will be refunded,
  • refunds will be issued within 14 days from receipt of the returned goods,
  • the refund may be withheld until the goods have been received and inspected.

Refunds will be made using the same payment method used for the original transaction, unless otherwise agreed.

Return Shipping Costs

Return shipping costs are borne by the Customer, except in cases of:

  • verified defective products,
  • errors attributable to Vacuum Tubes Treasures.

In such cases, return shipping costs will be fully covered by us.

Damaged or Incorrect Items

If the Customer receives a damaged or incorrect item, it must be reported within 5 (five) working days from delivery, by email or telephone, clearly stating the issue.

Uncollected Parcels, Storage, and International Shipments

It is the Customer’s responsibility to monitor the shipment and promptly arrange for collection or customs clearance.
Any costs, delays, or losses resulting from:

  • failure to collect the parcel,
  • prolonged storage,
  • abandonment of the parcel at customs,

do not entitle the Customer to any refund.

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.