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TELEFUNKEN

12AX7 ECC83 NOS TELEFUNKEN Tested Pair Tubes – Smooth Plates Diamond Bottom Western Germany

12AX7 ECC83 NOS TELEFUNKEN Tested Pair Tubes – Smooth Plates Diamond Bottom Western Germany

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12AX7 ( ECC83 ) NOS TELEFUNKEN Smooth Plates Diamond <> Bottom Tested Pair Tubes Made in Western Germany '60s

Sound Description:

The 12AX7 TELEFUNKEN , in the prestigious Smooth Plates version with diamond logo <> engraved on the bottom , represents one of the most refined and sought-after expressions in the history of European valve production.
This tested NOS pair, produced in West Germany in the 60s , stands out for 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.

Bass : fast, dry and articulated. The low frequencies are present with surgical precision, without exuberance or slowness. Ideal for systems that require timbre rigor and immediate response in the low range.

Mids : extraordinarily transparent and neutral. Voices are centered, detailed and natural, with a sober and faithful timbre. Acoustic instruments are returned with clarity, without any artificial coloration or emphasis. The mids are the undisputed strong point of this valve.

Highs : extended, bright and always under control. The upper end is airy, but never sharp or aggressive. The brilliance is refined, contributing to the airiness of the soundstage without compromising listening comfort.

Dynamics : Impeccable. Transient response is fast but fluid, with an expressive naturalness that enhances every dynamic nuance. Even the most sudden excursions are handled with balance and coherence.

Soundstage : wide, deep and perfectly defined. The stereo image is clear, stable and well focused, with a very accurate separation of the sound planes. The scene opens in a realistic and controlled way, without artifice.

The 12AX7 TELEFUNKEN NOS Smooth Plates – Diamond Bottom – Made in Western Germany '60s, is a valve with an analytical, balanced and highly musical character, ideal for those who want maximum neutrality without sacrificing detail and micro-dynamics .

🎧 Use in Headphone Amplifiers and Driver Stages Hi-Fi

Perfect for high-end preamps, tube DACs and reference headphone amplifiers. It offers transparent, quiet and detailed performance, ideal with headphones such as the Sennheiser HD800S , Focal Utopia , Beyerdynamic T1 , or ZMF Vérité . Spatial reconstruction and harmonic response are reference.

🎸 Use in Guitar and Bass Amplifiers

Highly appreciated in the musical field for its tonal coherence and the absence of harshness. Used in vintage Fender amps, Vox AC30 and Marshall Plexi, it provides a defined, fluid and full of harmonics sound, both in clean and in controlled overdrive.

🎯 Note for audiophiles and technicians
One of the most neutral and musical valves ever made, recommended for those who want absolute transparency, dynamic balance and tonal refinement , without introducing character.


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

Valve 1 :

  • Section 1 : Gm = 1500 ; Ia = 0.8 mA
  • Section 2 : Gm = 1500 ; Ia = 1.0 mA

Valve 2 :

  • Section 1 : Gm = 1200 ; Ia = 1.1 mA
  • Section 2 : Gm = 1700 ; Ia = 1.2 mA

Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and rated for use in hi-fi systems and guitar amplifiers.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Conditions: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic Condition: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.
  • Manufacturing Code: Unreadable - Present the Telefunken Rhombus impressed on the glass between the feet

Burglar-Proof Security Seal Policy:

Each product is sealed to ensure quality and integrity.
The right of withdrawal is subject to the tamper-proof seal being kept intact, as required by the Consumer Code.


Eco-friendly packaging:

The valve will be shipped with protected packaging to ensure safety during transportation.
We use recycled and recyclable paper for packaging, and brown tape ECO-KRAFT , eco-friendly and solvent-free.


Important Notes:

This tube, produced to the standards of the time, is designed to work in equipment compatible with vintage tubes.
It is recommended to follow the safety guidelines to avoid malfunctions or damage.


Security Guarantee:

Although not tested to modern GPSR regulations, this valve has been designed to operate safely under the conditions for which it was manufactured.
We recommend using it with equipment that supports vintage tubes, to avoid the risk of malfunction or damage.


Safety information:

  • Attention: Keep out of reach of children.
  • To be used under adult supervision.
  • Use this product only with equipment designed for vintage 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.