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TELEFUNKEN

12AX7 ECC83 NOS TELEFUNKEN Ribbed Plates Diamond Bottom Matched Pair Tubes Made in Western Germany

12AX7 ECC83 NOS TELEFUNKEN Ribbed Plates Diamond Bottom Matched Pair Tubes Made in Western Germany

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12AX7 (ECC83) TELEFUNKEN NOS Ribbed Plates Diamond Bottom – Matched Pair Tubes – Made in Western Germany


Sound Description:

The 12AX7 / ECC83 TELEFUNKEN, in this rare NOS version with ribbed plates, diamond <> bottom, and matched pair configuration, stands as one of the most legendary tubes from post-war European production.
Manufactured at the Ulm plant (West Germany), it is universally acclaimed for its airy musicality, extreme tonal transparency, and its ability to maintain control and coherence even under complex operating conditions.

Bass: Dry, fast, and perfectly controlled. The low end is not boosted, but rather precise, dynamic, and free of muddiness — ideal for systems that prioritize instrumental separation.

Midrange: Clear, open, and detailed. Vocals are refined, realistic, and well-centered, while acoustic instruments emerge naturally. This midrange is analytically voiced but never sterile, capable of combining precision and musicality.

Highs: Sparkling, refined, and never aggressive. The top end is among the most appreciated in European tube production: it delivers airiness, detail, and microdynamics without causing listening fatigue, even at sustained volumes.

Dynamics: Quick and articulate. The tube precisely follows every change in intensity, maintaining proportional and stable response in both delicate passages and sudden peaks.

Soundstage: Wide, airy, and three-dimensional. The stereo image is vivid, with excellent separation across the sound layers and a tonal coherence that encourages an immersive and analytical listening experience.

The 12AX7 TELEFUNKEN Ribbed Plates – Diamond Bottom – Matched Pair – NOS is one of the most refined and reliable choices for high-resolution audio, where transparency, micro-detail, and consistency are paramount.


🎧 Use in Headphone Amplifiers and Hi-Fi Driver Stages
Ideal as a gain stage in high-end preamplifiers, tube DACs, or reference OTL amplifiers. This matched pair ensures low noise, tonal balance, and exceptional detail resolution — perfect in combination with reference headphones such as Audeze LCD-5, Focal Utopia, and Sennheiser HD800S.

🎸 Use in Guitar and Bass Amplifiers
In musical applications, the Telefunken ECC83 Ribbed Plates is highly sought after for its defined, dynamic sound free from harshness. It offers outstanding control even under distortion, making it a perfect choice for the early preamp stages of boutique heads or vintage amplifiers like the Marshall JTM45, Fender Deluxe Reverb, or Hiwatt DR103.

🎯 For Audiophiles and Technicians
One of the most neutral, stable, and long-lasting tubes ever produced. Perfect for those seeking a crystal-clear sonic presentation, with controlled harmonic performance and a refined, objective tonal footprint.


Test Results

Tested on AMPLITREX AT-1000 Tube Tester

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

Tube 1:

  • Section 1: Gm = 1600 ; Ia = 1.3 mA
  • Section 2: Gm = 1500 ; Ia = 1.0 mA

Tube 2:

  • Section 1: Gm = 1600 ; Ia = 1.2 mA
  • Section 2: Gm = 1700 ; Ia = 1.3 mA

Additional Tests Performed:

  • Microphonics: Low Noise & Microphonics – Tested and compliant for use in hi-fi systems and guitar amps.
  • Emission Quality: Excellent – Very strong and stable emission with no fluctuation.
  • Shorts & Gas: None detected.

Condition:

  • Type: NOS – New Old Stock – Tested and functional – Supplied in our custom protective box.
  • Functionality: Fully operational.
  • Cosmetic Condition: Fair – Lettering partially faded or barely legible, general aesthetic shows visible signs of age. Please see photos for details.
  • Production Code: Not present. Manufacturing period identified by internal structure – Made in Berlin during the 1960s – Features the impressed Telefunken diamond mark between the pins.

Tamper-Evident Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal being intact, as required by the Consumer Code.


Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper, and solvent-free ECO-KRAFT brown tape.


Important Notes:
This tube, produced according to the standards of its time, is designed to operate in equipment compatible with vintage vacuum tubes.
We recommend following proper safety guidelines to avoid malfunction or damage.


Safety Disclaimer:
While not tested under current GPSR regulations, this tube was designed to operate safely within the intended original conditions.
We strongly recommend using it with equipment designed to support vintage tubes to prevent malfunction or damage.

Safety Information:

  • Warning: Keep out of reach of children.
  • To be used under adult supervision.
  • Use only with equipment specifically designed for vintage vacuum tubes.

Condizioni di vendita e sicurezza

Anti-Tamper Security Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal remaining intact, as provided for by the Consumer Code.

Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper for packaging, along with brown ECO-KRAFT adhesive tape, eco-friendly and solvent-free.

Important Notes:
This tube, manufactured according to the standards of its era, is designed to operate in equipment compatible with vintage tubes.
It is recommended to follow standard safety guidelines to avoid malfunctions or damage.

Safety Assurance:
Although not tested according to modern GPSR regulations, this tube was designed to operate safely under the conditions for which it was manufactured.
We recommend using it only with equipment that supports vintage tubes, in order to avoid risks of malfunction or damage.
Technical data note:
In some cases, the technical data provided may be based on datasheets from other manufacturers or on equivalent historical specifications, when a specific official datasheet for the production batch of the listed item is not available.
Electrical characteristics may vary slightly depending on the production batch and manufacturing period, as is typical for thermionic components.

Safety Information:
Warning: Keep out of reach of children.
To be used under adult supervision.
Use the product only with equipment designed for vintage tubes.

Shipping & Returns

Shipping & Returns

Shipping Costs

Shipping costs vary depending on the total amount of the items in the cart and are calculated automatically during the checkout process.
All shipments are fully insured. The courier is automatically selected based on destination, weight, and shipment characteristics.

Shipping Times and Delivery

The indicated delivery times are purely indicative.
Any delays, storage issues, or operational changes made by the carrier (for example during peak periods such as holidays) are not attributable to Vacuum Tubes Treasures.

In such cases, we will nevertheless provide the Customer with all necessary support to open claims or assistance requests with the appointed courier.

International Shipping (Non-EU Countries)

For orders shipped to countries outside the European Union, any customs duties, import taxes, or additional charges are the sole responsibility of the recipient.
Vacuum Tubes Treasures has no control over these costs, which may vary from country to country. Customers are therefore advised to contact their local customs authorities prior to placing an order.

Warranty

All products sold by Vacuum Tubes Treasures are covered by the legal warranty of conformity, in accordance with Italian Legislative Decree No. 206/2005 (Consumer Code) and the Italian Civil Code (Articles 1490 et seq.), under the conditions set out below.

Warranty for Vacuum Tubes

Vacuum tubes, being components subject to wear and of vintage or specialized nature, are covered by a specific warranty of 6 (six) months from the date of delivery.
The warranty covers exclusively proven manufacturing or conformity defects that arise during proper use in accordance with technical specifications.

The warranty does not cover:

  • normal wear and tear,
  • subjective sound preferences,
  • use in incompatible equipment,
  • tampering or improper use.

Right of Withdrawal

Purchases made on the Vacuum Tubes Treasures website are governed by Italian regulations on distance contracts (Legislative Decree No. 206/2005).

Consumers have the right to withdraw from the contract within 14 (fourteen) days from the date of receipt of the goods, without providing any reason.

Conditions for Exercising the Right of Withdrawal

The right of withdrawal may be exercised only if:

  • the product has not been used,
  • the product is returned in its original condition,
  • the tamper-evident security seal is intact and not broken.

📌 Returns are not accepted for reasons related to sound preference, tube rolling, or subjective audio evaluation.
As with a music recording, a vacuum tube cannot be returned simply because its sound does not match personal taste.

Effects of Withdrawal

In the event of a valid withdrawal:

  • all payments received, including standard shipping costs, will be refunded,
  • refunds will be issued within 14 days from receipt of the returned goods,
  • the refund may be withheld until the goods have been received and inspected.

Refunds will be made using the same payment method used for the original transaction, unless otherwise agreed.

Return Shipping Costs

Return shipping costs are borne by the Customer, except in cases of:

  • verified defective products,
  • errors attributable to Vacuum Tubes Treasures.

In such cases, return shipping costs will be fully covered by us.

Damaged or Incorrect Items

If the Customer receives a damaged or incorrect item, it must be reported within 5 (five) working days from delivery, by email or telephone, clearly stating the issue.

Uncollected Parcels, Storage, and International Shipments

It is the Customer’s responsibility to monitor the shipment and promptly arrange for collection or customs clearance.
Any costs, delays, or losses resulting from:

  • failure to collect the parcel,
  • prolonged storage,
  • abandonment of the parcel at customs,

do not entitle the Customer to any refund.

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.