1 17

MULLARD

12AX7 / ECC83 Mazda Valve Tested Pair Same Date Codes Short Grey Plates Halo Getter England BVA

12AX7 / ECC83 Mazda Valve Tested Pair Same Date Codes Short Grey Plates Halo Getter England BVA

€169,90 EUR
€169,90 EUR
Sale Sold out
Taxes included. Shipping calculated at checkout.

12AX7 / ECC83 Mazda Valve – Selected Pair – Same Codes I62 / IK12 – Short Gray Plates – Halo Getter – Made in England BVA

AMPLITREX Tested – VERY STRONG – Selected Vintage Pair – Same Codes – British Production

Description

Selected pair of 12AX7 / ECC83 Mazda Valve, Made in England BVA production, chosen for constructive consistency, identical production codes and overall very solid electrical characteristics.

The tubes feature Short Gray Plates, top Halo Getter and Mazda Valve / BVA marking. The codes impressed on the glass are I62 / IK12, present on both tubes, a positive element for productive, aesthetic and constructive consistency.

The code I62 identifies the ECC83 / 12AX7 family in the second constructive revision; the factory/date code starting with “I” is associated with Thorn-AEI / Ediswan, indicated in the Philips/Mullard lists as “Mullard supply”. For this reason, the pair is cautiously indicated as likely British production from the 1960s.

The internal construction is typical of British short plate ECC83s of the period, very close to the 1960s Mullard architecture, with a compact, solid and appreciated design in both hi-fi and musical applications.

Tested with the Amplitrex AT-1000 Tube Tester, the tubes achieved an overall VERY STRONG result. This is not a precision matched pair, but a Selected Vintage Pair chosen for identical construction, identical codes and electrical robustness.

Sonically, they offer a natural, balanced and pleasantly British sound, with orderly bass, present and musical mids, and sweet, well-integrated highs. The presentation is fluid, controlled and suitable for extended listening, with the typical charm of vintage English ECC83s.

Suitable for preamplifiers, line stages, compatible phono stages, driver stages, hi-fi circuits and instrument amplifiers compatible with 12AX7 / ECC83.

A Mazda Valve Made in England BVA pair truly selected by Vacuum Tubes Treasures, ideal for those seeking two vintage British ECC83s with identical codes, homogeneous construction and classic English sonic character.

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 #1:

  • Section 1: Gm = 1500 ; Ia = 1.0 mA
  • Section 2: Gm = 1800 ; Ia = 1.6 mA

Tube #2:

  • Section 1: Gm = 1300 ; Ia = 0.8 mA
  • Section 2: Gm = 1600 ; Ia = 1.1 mA
Additional Tests Performed:
  • Microphonics: Low. Suitable for many hi-fi and musical applications, particularly in line stages, drivers, and non-excessively critical preamp positions.
  • Noise: Low and well-controlled. Silent operation in hi-fi and musical amplifiers in designated positions.
  • Balance: Sections are not perfectly matched. The tubes are suitable for use in non-critical hi-fi stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring rigorous balance between sections.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Excellent – Markings excellently preserved, minimal signs of age. See photos for details.

Manufacturing Code: 

  • Impressed codes: I62 / IK12
    Type: ECC83 / 12AX7, I62 revision
    Factory / supply: Thorn-AEI / Ediswan, Mullard supply
    Dating: 1960s British production

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
📧 info@vacuumtubestreasures.com

View full details

  • 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.