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MULLARD

12AX7 / ECC83 NOS MULLARD by Philips Heerlen 1958 – Long Gray Plates – Foil Getter – AMPLITREX Tested

12AX7 / ECC83 NOS MULLARD by Philips Heerlen 1958 – Long Gray Plates – Foil Getter – AMPLITREX Tested

714.00 ILS
714.00 ILS
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12AX7 / ECC83 NOS MULLARD by Philips Heerlen ( Holland ) 1958

Long Gray Plates – Foil Getter – Well Balanced – Low Noise & Microphonics

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:

  • Section 1: Gm = 1600 ; Ia = 1.0 mA
  • Section 2: Gm = 1500 ; Ia = 0.9 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.
  • Noise: Low and well controlled. Quiet operation in hi-fi and musical amplifiers in designated positions.
  • Balance: The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Short Circuits and GAS: Absent.

Description:

Precious 12AX7 / ECC83 NOS MULLARD produced by Philips at the Heerlen plant, authentic Dutch production Made in Holland from 1958, characterized by the sought-after Long Gray Plates construction with Foil Getter, typical of the first Philips ECC83s in Europe and today particularly appreciated by high-end vintage tube enthusiasts.

The MULLARD branding in this specimen matches the actual Philips Heerlen production, confirmed by the etched code mC6 Δ8K, traceable to the Dutch plant and to November 1958. A combination of great technical and collectible interest, especially for those seeking authentic European ECC83s from the late 1950s.

The tube has been carefully tested in our laboratory using Amplitrex AT-1000 Tube Tester, obtaining a VERY STRONG rating. The two sections measured respectively Gm 1600 / Ia 1.0 mA and Gm 1500 / Ia 0.9 mA, showing strong, consistent and well-aligned values. Emission was excellent, very stable and free of fluctuations, with no short circuits, gas or anomalies detected.

It was also selected for Low Noise & Microphonics, with low and well-controlled noise, making it particularly suitable for phono stages, V1 and high-gain positions sensitive to noise and microphonics. The good balance between the two triodes allows for very versatile use in hi-fi and instrumental applications.

From a sonic point of view, the early Philips Heerlen Long Plates ECC83s are sought after for a wide, refined and natural presentation, with rich and harmonically complex mids, articulate bass and open and detailed high frequencies, always maintaining a fluid musicality free of harshness. The soundstage tends to be airy, deep and well-focused, qualities that make these productions particularly interesting in high-level audio systems.

Ideal for hi-fi preamplifiers, phono stages, integrated amplifiers, line stages, DACs and tube buffers, guitar amplifiers and vintage restorations compatible with 12AX7 / ECC83.

The tube is NOS – New Old Stock, carefully tested and perfectly functional. The aesthetic conditions are excellent, with excellently preserved screen printing and minimal signs of age. It is supplied in our custom box for optimal protection.

A rare and precious MULLARD by Philips Heerlen 12AX7 / ECC83 Long Gray Plates Foil Getter from 1958, actually tested and selected by Vacuum Tubes Treasures, ideal for those seeking a high-end NOS European ECC83, very strong, well balanced and selected Low Noise & Microphonics.

Conditions:

  • Conditions: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Aesthetic conditions: Excellent – Excellently preserved lettering, minimal signs of age. See photos for details.
  • Manufacturing Code: mC6 Δ8K (Barely perceptible) - Δ8K Δ → Heerlen (Holland), 8 (three digits) → 1958 - K → November

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
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