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HEINTZ & KAUFMAN

12AU7WA / CV4003 / 6189 Heinz & Kauffman Triple Mica Black Plates Square Getter Made in USA

12AU7WA / CV4003 / 6189 Heinz & Kauffman Triple Mica Black Plates Square Getter Made in USA

€44,90 EUR
€44,90 EUR
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12AU7WA / CV4003 / 6189 Heinz & Kauffman Triple Mica Black Plates Square Getter Made in USA

Ultra Low Noise & Microphonics – Series “Gammatron”

Description:

This 12AU7WA / CV4003 Heinz & Kauffman – “Gammatron” production , made in the United States and intended for highly reliable military and industrial applications, represents one of the most valuable and difficult to find versions of the 12AU7WA family. The construction with triple mica , black plates and square getter immediately highlights its superior standard: maximum resistance to vibration, extremely low microphonics and extraordinary electrical stability.
The unit was tested with the Amplitrex AT-1000 in our lab, reporting STRONG results, fully compliant with high-end hi-fi applications, professional preamplifiers, studio equipment and circuits requiring a robust, quiet and linear tube. A reference choice for those seeking the highest levels of build quality and tone.

Sound Characteristics
The 12AU7WA “Gammatron” delivers a clear, authoritative, and artifact-free tone. The triple mica and black plate combination delivers an ideal balance of body, transparency, and refinement, delivering a consistently stable and consistent sound even in complex configurations.

  • Bass
    Clean, controlled, and well-defined lows. No bloat, excellent weight and definition. The response remains solid even with dynamic music or dense recordings.
  • Medium
    Rich, natural, and very musical. Voices emerge with material realism, while acoustic and jazz instruments display a fine and believable harmonic texture. The mids are never dull, never aggressive.
  • High
    Smooth, bright, and well-extended. No harshness, no annoying peaks: refined, airy highs with excellent micro-detail. Elegant and consistently pleasant timbre.
  • Dynamics
    Superior responsiveness: quick engagement, precise release, excellent control even under variable load conditions. The valve maintains exemplary linearity under dynamic changes.
  • Soundstage
    Organized, wide, and deep soundstage. Excellent instrument separation, stable and balanced imaging. The "Gammatron" contributes to a clean and credible soundstage, ideal for critical listening.

🎧 Use in Hi-Fi Stereo Amplifiers
Excellent in tube preamps, driver sections of push-pull or single-ended amplifiers, tube-based DACs, and high-end equipment requiring quiet operation and tonal balance. Perfect for jazz, classical, acoustic, and high-resolution listening.
An absolute top-notch 12AU7WA for premium systems.

🎸 Use in Music Amplifiers
It's a great driver tube in boutique guitar amplifiers, providing headroom, clarity, responsiveness, and a rich, organic midrange. It's also excellent in studio environments, vintage microphone preamps, and professional rack units.

🎯 Note for audiophiles and technicians
The 12AU7WA Heinz & Kauffman Gammatron production is considered one of the most solid and musical interpretations of the 12AU7WA series, thanks to the combination of triple mica , black plates , square getter and high-end industrial selection.
This example is Amplitrex Tested – STRONG , and comes in our certified packaging with a tamper-proof seal. This is a rare, prestigious tube, particularly prized by collectors and enthusiasts of quality vintage USA.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -8.5V
  • Average 100%: Gm = 2200 ; Ia = 10.5 mA
  • Test Result: VERY STRONG

Valve:

  • Section 1: Gm = 1800 ; Ia = 8.4 mA
  • Section 2: Gm = 1800 ; Ia = 8.6 mA
Additional Tests Performed:
  • Microphonics: Very Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.
  • Balance: The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Conditions: Vintage - 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: Unreadable – Made in the USA, identifiable by construction features. Late 1950s – early 1960s

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
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📧 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.