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ECC88 / 6DJ8 HP by PHILIPS Heerlen Δ2L3 Disc Dimpled Getter Matched Pair Made in Holland ’60s

ECC88 / 6DJ8 HP by PHILIPS Heerlen Δ2L3 Disc Dimpled Getter Matched Pair Made in Holland ’60s

€129,90 EUR
€129,90 EUR
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ECC88 / 6DJ8 HP by PHILIPS – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY STRONG – Made in Holland ’60s

AMPLITREX Matched Pair – Low Noise & Microphonics – Vintage Dutch Philips Heerlen Production

Test Results

Tested on AMPLITREX AT-1000 Tube Tester

Voltage Test: Va = 90V ; Vg = -1.2V
Average 100%: Gm = 12.50 ; Ia = 15.0 mA
TEST RESULT: VERY STRONG

Tube 1:

  • Section 1: Gm = 11.10 ; Ia = 11.4 mA
  • Section 2: Gm = 11.20 ; Ia = 11.8 mA

Tube 2:

  • Section 1: Gm = 10.83 ; Ia = 10.2 mA
  • Section 2: Gm = 10.20 ; Ia = 10.4 mA

Additional tests performed:
  • Microphonics: Low. Tested and compliant for hi-fi use, including in phono stages and guitar amplifiers, even in V1 position.
  • Emission Quality: Excellent – Very strong and stable emission, no fluctuations.
  • Shorts and GAS: None.

Description:

Refined pair of ECC88 / 6DJ8 with Hewlett-Packard branding, built at the Philips factory in Heerlen, Netherlands, and identified by the etched code Δ2L3. This code dates the production to the third week of December 1962, while the Disc Dimpled Getter structure represents one of the characteristic configurations of Dutch production from that period.

The Hewlett-Packard branding signifies its OEM designation for the historic American manufacturer of electronic instruments and laboratory equipment. Beyond the commercial label, the factory code etched on the glass clearly documents its Heerlen Made in Holland origin, which is highly sought after by vintage European tube enthusiasts.

The two tubes constitute an Amplitrex Matched pair with good overall consistency. Tube 1 shows an average transconductance of 11.15 mA/V and an average anode current of 11.6 mA; Tube 2 measures an average of 10.52 mA/V and 10.3 mA. Both specimens also show excellent internal balance: the respective sections are very close in both transconductance and anode current.

Operation proved stable and smooth, with low microphonics, no gas, and no shorts. This selection makes the pair suitable for hi-fi preamplifiers, headphone amplifiers, buffers, line stages and drivers, as well as for laboratory equipment and musical instrument amplifiers compatible with ECC88 or 6DJ8. The low microphonics allow for use in even the most sensitive stages, including input positions and, in compatible equipment, phono stages.

In terms of sound, Heerlen-produced ECC88s are appreciated for a transparent, airy, and refined presentation, with a natural midrange, extended and well-defined high frequencies, and fast, controlled bass. In hi-fi systems, they promote an orderly soundstage, good instrument separation, and a detailed reproduction without sacrificing musicality.

A proposal of significant interest for those seeking an authentic vintage European pair, with documented Heerlen origin, Disc Dimpled Getter, well-balanced sections, and low microphonics: two Hewlett-Packard ECC88 / 6DJ8 tubes produced in Holland in December 1962, individually tested and ready for use.

Condition:

  • Condition: Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Cosmetic Condition: Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.
  • Manufacturing Code: Δ2L3 → Δ → Heerlen (Netherlands), 2 → 1962 - L → December - 3 → 3rd week of the month

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.

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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.

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