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TELEFUNKEN

12AX7 / ECC83 TELEFUNKEN Tested Tube – Ribbed Plates Diamond Bottom Made in Germany

12AX7 / ECC83 TELEFUNKEN Tested Tube – Ribbed Plates Diamond Bottom Made in Germany

€129,00 EUR
€129,00 EUR
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12AX7 ( ECC83 ) TELEFUNKEN Tested Tube - Ribbed Plates Diamond <> Bottom Made in Germany '60s

Description:

The 12AX7 TELEFUNKEN , in the prestigious Ribbed Plates version with the diamond logo <> engraved on the bottom , represents one of the most refined and sought-after expressions in the history of European valve production.
This valve head , produced in Germany in the 60s , is distinguished by an extremely clean, neutral and stable sound , which makes it an absolute reference for top-level hi-fi applications, recording studios and professional audio equipment.

Sound Characteristics

Bass: The low range is dry, precise, and very controlled . There is no artificial emphasis: the bass is uncluttered, fast, and legible, contributing to a solid, stable foundation, particularly suited to systems that prioritize clarity and articulation.

Mids: The strong point of this design. The mids are extremely linear, transparent, and neutral , with vocals faithfully reproduced to their original timbre. Acoustic instruments emerge with great clarity and lack of coloration, making this tube ideal for high-resolution systems.

Highs: Clean, extended, and finely refined. The high end is airy yet controlled , with a very fine grain and no harshness. Listening is open and stable, without fatigue even over long periods.

Dynamics: Measured and coherent. The response prioritizes microdynamics and the continuity of the musical message, avoiding any dramatic effects. Transients are rendered with precision and naturalness.

Soundstage: The soundstage is tidy, stable, and well-focused . The separation of planes is clear, with believable depth and a rational imaging, typical of the Telefunken approach.

🎧 Use in Hi-Fi Amplifiers

Ideal for preamplifiers and input stages of hi-fi systems that require neutrality, transparency, and tonal accuracy . Particularly suitable for already balanced systems, where you want to preserve signal fidelity without introducing coloration.

🎸 Use in Music Applications

They are also popular in instrument amplifiers and studio equipment, especially where definition, quietness, and predictable response are required. They offer a clean, controlled sound with great detail readability.

🎯 Note for audiophiles

This 12AX7 / ECC83 TELEFUNKEN Ribbed Plates – Diamond Bottom is intended for the experienced audiophile who appreciates a technical, balanced and rigorous approach.
Selection and testing ensure stability and operational consistency. An honest, defensible, and musically correct proposition, in line with the Vacuum Tubes Treasures philosophy: the valve as an instrument of fidelity, not as an artifice.

Test Results

Tested on AMPLITREX AT-1000 Tube Tester

Voltage Test: Va = 250V, Vg = -2V
Average 100%: Gm = 1600 ; Ia = 1.2 mA
TEST RESULT: STRONG

Valve:

  • Section 1 : Gm = 1300; Ia = 0.8 mA
  • Section 2 : Gm = 1400; Ia = 0.8 mA

Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections are coherent and well aligned, making the valve also suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Output Quality: Excellent – ​​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: Fair – All writing has disappeared. Small imperfection on the glass. See photos for details.
  • Manufacturing Code: None – Made by TELEFUNKEN, identifiable by its 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.