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TELEFUNKEN

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

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

52.100 HUF
52.100 HUF
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12AX7 (ECC83) NOS TELEFUNKEN Tested Tube - Ribbed Plates Diamond <> Bottom Made in Germany '60s

AMPLITREX Tested – Balanced Sections – Low Noise & Microphonics – Vintage TELEFUNKEN Production

Description:

This 12AX7 / ECC83 TELEFUNKEN NOS, produced in Germany in the 1960s and identifiable by the unmistakable Diamond <> mark printed in the glass at the base, represents one of the most famous and sought-after signal tubes ever made.

The construction with Ribbed Plates identifies the classic configuration of TELEFUNKEN production during the German company's period of maximum industrial maturity, appreciated worldwide for construction precision, exceptional longevity, and extraordinary tonal neutrality.

TELEFUNKEN ECC83 Diamond Bottom tubes are still considered an absolute benchmark for those seeking transparency, detail, and musical coherence, qualities that have made them key components in numerous European hi-fi, broadcast, and professional equipment.

This tube has been carefully tested using an AMPLITREX AT-1000, proving to be VERY STRONG, quiet, and perfectly stable.

Aesthetically, it is in good overall condition. The original markings are partially worn by time but still recognizable, while the tube body and internal structure remain well preserved, as shown in the photographs.

Sonic Characteristics

TELEFUNKEN Ribbed Plates are renowned for an extremely balanced and refined sound profile.

Unlike other vintage ECC83s that tend to characterize the sound more, these TELEFUNKENs aim for maximum fidelity and transparency.

Bass

The bass is precise, controlled, and articulate, with excellent definition of musical lines and no artificial bloat.

Mids

The midrange is extremely clean and natural, with a particularly credible and realistic reproduction of voices.

Highs

The highs are one of the strong points of this production: extended, airy, and detailed, without harshness or aggressiveness.

Dynamics

Dynamic response is fast and accurate, with excellent ability to follow the finest musical variations.

Soundstage

The soundstage is wide, stable, and well-focused, with excellent separation between instruments and performers.

🎧 Use in Hi-Fi Amplifiers

This TELEFUNKEN ECC83 is particularly suitable for:

  • High-end tube preamplifiers
  • MM and MC phono stages
  • Integrated hi-fi amplifiers
  • DACs and tube audio equipment
  • Professional and broadcast equipment
  • Restorations of vintage European electronics

The Low Noise & Microphonics selection makes it particularly interesting even for the most critical positions in the circuit.

🎸 Use in Musical Applications

TELEFUNKEN Diamond Bottom tubes are also highly valued in music for those seeking:

  • Great note definition
  • Excellent intelligibility
  • Fast and precise dynamics
  • Extremely linear response

Particularly interesting in boutique amplifiers, recording, and professional applications where transparency and detail are priorities.

🎯 Note for Audiophiles

Authentic TELEFUNKEN Diamond Bottom Made in Germany tubes represent one of the most sought-after ECC83s in the global vintage tube market.

Identification via:

  • Original Diamond <> Bottom
  • German production from the 1960s
  • Ribbed Plates
  • Authentic TELEFUNKEN construction
  • VERY STRONG AMPLITREX test
  • Low Noise & Microphonics

makes this example particularly interesting for both high-level audio use and collecting.

This tube still maintains very high electrical performance, exceeding the nominal average required for quality hi-fi use.

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: VERY STRONG

Tube :

  • Section 1: Gm = 1600 ; Ia = 1.2 mA
  • Section 2: Gm = 1500 ; Ia = 1.0 mA

Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational.
  • Aesthetic condition: Good – Markings partially worn, but still legible. Tube body in good condition. See photos for details.
  • Manufacturing Code: absent – TELEFUNKEN production, identifiable by construction characteristics. 1960s

Discover why our tubes 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.

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