1 14

HEINTZ & KAUFMAN

12AX7 / ECC83 NOS Heinz & Kauffman – Gray Plates Foil Dimpled Getter – Made in USA '50s – AMPLITREX Tested – Low Noise

12AX7 / ECC83 NOS Heinz & Kauffman – Gray Plates Foil Dimpled Getter – Made in USA '50s – AMPLITREX Tested – Low Noise

€149,00 EUR
€149,00 EUR
Sale Sold out
Taxes included. Shipping calculated at checkout.

12AX7 / ECC83 NOS Heinz & Kauffman – Gray Plates – Foil Dimpled Getter – Made in USA – AMPLITREX Tested

Description:

This NOS 12AX7 / ECC83 marked Heinz & Kauffman , made in the USA in the 1950s , belongs to the tradition of American signal tubes made to very high construction standards.

The Heinz & Kauffman brand was used by a well-known American distributor who selected and rebranded valves produced by major American factories of the time. The available examples feature internal construction typical of 1950s American production, characterized by meticulous mechanical engineering and high-quality materials.

The internal structure includes:

  • Gray Plates
  • Foil Dimpled Getter
  • robust construction typical of American productions of the period

The valve is in showcase aesthetic condition , with well-preserved silkscreen prints and a perfectly intact internal structure.

It has been individually tested in our laboratory with AMPLITREX AT-1000 , checking emission, stability and operational behavior.

Sound Characteristics

The American 12AX7s from the 1950s are known for a balanced, natural and very musical sound presentation.

Bass: Precise and well-controlled. The low range maintains good depth without losing definition.

Mids: Rich and natural. Vocals sound very believable, and instruments like piano, strings, and acoustic guitar emerge with excellent harmonic balance.

Highs: Clean and well-extended. The high end maintains a fine grain that promotes smooth, natural listening.

Dynamics: Very responsive. The tube precisely follows the variations in the musical signal while maintaining good microdynamics.

Soundstage: Stable and well-organized soundstage, with natural separation of instruments.

🎧 Use in Hi-Fi Stereo Amplifiers

The 12AX7 / ECC83 is one of the most popular signal tubes in audio equipment design.

It is used in:

  • tube preamplifiers
  • phono stages
  • amplifier drivers
  • integrated amplifiers and vintage equipment

Thanks to its low microphonics and low noise , this specimen is also suitable for sensitive circuit positions , where stability and quietness are particularly important.

🎸 Use in Music Amplifiers

The ECC83/12AX7 is one of the most widely used tubes in musical instrument amplifiers.

Vintage American valves generally offer:

  • excellent midrange definition
  • good dynamic response
  • great touch sensitivity

Qualities that allow for an articulate and musical sound in guitar circuits.

🎯 Note for audiophiles and technicians

  • Heinz & Kauffman – USA production 1950s
  • 12AX7 / ECC83 NOS
  • Gray Plates – Foil Dimpled Getter
  • Showcase aesthetic conditions
  • AMPLITREX AT-1000 Tested
  • Low Noise & Microphonics
  • Rating: VERY STRONG

A vintage American signal tube , built to the quality standards of 1950s production, capable of offering operational stability, silence and a natural and balanced sound presentation , qualities that continue to make it highly appreciated by audiophiles, technicians and musicians .

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 1.2 mA
  • Test Result: STRONG

Valve:

  • Section 1: Gm = 1600 ; Ia = 1.3 mA
  • Section 2: Gm = 1500 ; Ia = 1.1 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:

  • Condition: NOS - New Old Stock - 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. 1950s

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.