1 18

HP

ECC88 / 6DJ8 HEWLETT PACKARD – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY LOUD – Made in Holland '60s

ECC88 / 6DJ8 HEWLETT PACKARD – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY LOUD – Made in Holland '60s

€149,90 EUR
€149,90 EUR
Sale Sold out
Taxes included. Shipping calculated at checkout.

ECC88 / 6DJ8 HEWLETT PACKARD – Heerlen Δ2L3 – Disc Dimpled Getter – Matched Pair – VERY LOUD – Made in Holland '60s

Description:

This matched pair of Hewlett Packard branded ECC88/6DJ8s , produced in the historic Heerlen (Holland) plant in the early 1960s (identical codes Δ2L3), represents a high-level industrial selection of the famous European double triode.

The disc dimpled getter construction is typical of Heerlen production of the period, synonymous with construction precision, electrical consistency and reliability over time.

The valves are used, in good aesthetic condition and consistent with their age, with no structural alterations.
The presence of the Hewlett Packard brand adds an element of technical interest, as these valves were originally intended for instrumental and laboratory applications.

Tested in our lab on the Amplitrex AT-1000 , they are rated VERY STRONG. Matching is consistent and stable, with uniform electrical behavior between the two units.

Sound Characteristics

Bass: Precise, controlled, and well-structured. They provide a solid foundation without artificial bloat, maintaining articulation and definition.

Mids: Transparent and natural. The midrange is linear, with excellent clarity of vocals and correct harmonic reproduction of acoustic instruments.

Highs: Clean, extended, and well-finished. The top end is airy yet composed, with a fine grain typical of the Heerlen school.

Dynamics: Lively and well-supported. Excellent microdynamics and prompt transient response, with always controlled behavior.

Soundstage: Stable and three-dimensional. Good separation of sound planes and precise focus.

🎧 Use in Hi-Fi Amplifiers

Ideal for medium-high and high quality preamplifiers, line stages, tube DACs and headphone amplifiers.
Particularly suitable for those seeking neutrality, precision and operational stability.

🎸 Use in Technical and Musical Applications

The Hewlett Packard branding suggests a selection intended for measurement and laboratory contexts.
Also excellent for professional equipment and studios where stability and consistency are essential.

🎯 Note for audiophiles and technicians

  • Authentic production Amperex Heerlen (Δ2L3 identical)
  • Original 60s
  • Disc dimpled getter
  • Real Matched Pair
  • Amplitrex Test Rating VERY STRONG
  • Industrial origin Hewlett Packard

A pair that combines technical solidity, high output and historical authenticity, offering the typical Heerlen character in a stable, precise and reliable version, in true Vacuum Tubes Treasures style.

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: VERY STRONG

Valve 1:

  • Section 1: Gm = 11.1 ; Ia = 11.4 mA
  • Section 2: Gm = 11.2 ; Ia = 11.8 mA

Valve 2:

  • Section 1: Gm = 10.83 ; Ia = 10.2 mA
  • Section 2: Gm = 10.2 ; Ia = 10.4 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: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.
  • Manufacturing Code: Δ2L3 → Δ → Heerlen (Holland), 2 (four digits) → 1962 - L → December - 3 → 3rd week of the month

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.

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.