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HEINTZ & KAUFMAN

12AU7WA / CV4003 / 6189 Heinz & Kauffman Black Plates Halo Getter Made in USA

12AU7WA / CV4003 / 6189 Heinz & Kauffman Black Plates Halo Getter Made in USA

392,00 NOK
392,00 NOK
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12AU7WA / CV4003 / 6189 Heinz & Kauffman Black Plates Halo Getter Made in USA

Low Noise & Microphonics – Series “Gammatron”

Description:

This 12AU7WA / CV4003 / 6189 Heinz & Kauffman – “Gammatron” Series , Made in USA , represents one of the most select and valuable variants of the military-industrial 12AU7 family. The construction with black plates and halo getter demonstrates a superior level of quality, designed to guarantee reliability, thermal stability and silence in all operating conditions.

This is a Low Noise & Microphonics example, subjected to our Amplitrex AT-1000 testing process and rated a VERY STRONG TEST , ideal for reference hi-fi applications, professional equipment, sensitive preamplifiers and systems requiring absolute precision and cleanliness.

Sound Characteristics

The tone is balanced, refined, and coherent. The combination of black plates and Gammatron selection allows for a stable, rich, and defined sound, with superior control across the entire spectrum.

  • Bass: Full-bodied, precise, with excellent depth. Clean and well-controlled lows, ideal for transparent systems requiring detail without bloat.
  • Medium: Very natural, fluid, and rich in harmonics. The vocal performance is excellent: rich, believable, and with remarkable timbral realism. Perfect for critical listening.
  • Highs: Extended, clear, and musical. No harshness, no grain: a bright yet controlled high range, with great air and micro-detail.
  • Dynamics: Responsive and linear. The valve precisely follows both rapid and delicate changes, without compression or sagging. Excellent ability to maintain stability even under load.
  • Soundstage: Wide, well-layered soundstage, with stable imaging and excellent instrument separation. The halo-getter configuration contributes to an airy, three-dimensional soundstage.

🎧 Use in Hi-Fi Stereo Amplifiers

Perfect for high-end tube preamps, line stages, tube-based DACs, integrated amplifiers, and noise-sensitive professional equipment. Its quiet operation makes it ideal for high-efficiency speakers and dedicated listening environments.

🎸 Use in Music Amplifiers

Very effective in boutique guitar preamps, professional rack units, and classic mic preamps. It offers headroom, detail, and a very musical response: tight lows, full mids, and clean highs.

🎯 Note for audiophiles and technicians

The Heinz & Kauffman “Gammatron” series is among the most sought after by enthusiasts of vintage American valves, thanks to the mix of black plates, halo getters and low noise selection .

This example, tamper-proof packaged to Vacuum Tubes Treasures standards, represents an excellent choice for high-end systems, professional restorations, and collectors of USA-made tubes.

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 = 2200 ; Ia = 10.2 mA
  • Section 2: Gm = 2200 ; Ia = 10.4 mA
Additional Tests Performed:
  • Microphonics: 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. 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
www.vtt.store | www.vacuumtubestreasures.com
📧 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.