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RCA

12AX7 / ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s

12AX7 / ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s

$109.00 AUD
$109.00 AUD
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12AX7 / ECC83 RCA – Long Gray Plates – Square Getter – Made in USA ‘50s

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics – Vintage American RCA Production

Description:

This original 12AX7 / ECC83 RCA, produced in the USA in the 1950s, represents one of the most sought-after versions of the famous American dual triode, prized for its build quality and distinctive sonic character.

The internal structure showcases elements typical of RCA's best productions of the era:

  • Long Gray Plates
  • Square Getter
  • robust and precise internal construction

The square getter is a characteristic configuration of early productions, particularly appreciated today for vacuum stability and longevity.

The tube has been tested in our lab with Amplitrex AT-1000, yielding a VERY STRONG result, and verified for Low Noise & Microphonics, making it suitable even for sensitive circuit positions.

Sonic Characteristics

This 1950s RCA configuration offers a typically warm, full, and three-dimensional sound, with an extremely natural musical presentation.

Bass: Deep and round, with excellent structure and a sense of body. Never intrusive, but always well-controlled.

Mids: The true strong point: rich, textured, and incredibly expressive. Vocals are present, believable, and full of nuances.

Highs: Sweet and refined, never aggressive. Excellent extension with a velvety rendition typical of the best vintage RCA productions.

Dynamics: Smooth and natural, with a musical response that favors coherence and musicality over artificial impact.

Soundstage: Wide and well-layered, with excellent instrument separation and realistic depth.

🎧 Use in Hi-Fi Amplifiers

Ideal for:

  • tube preamplifiers
  • vintage and modern integrated amplifiers
  • phono stages (thanks to low noise)
  • quality buffers and line stages

Perfect for systems that require musicality, naturalness, and realistic harmonic reconstruction, with a typically "American" sonic footprint.

🎸 Use in Musical Applications

Also highly valued in instrumental settings for:

  • guitar amplifiers
  • vintage organs and instruments

It offers a warm, progressive, and musical response, with soft and controlled saturation, ideal for those seeking character without harshness.

🎯 Note for audiophiles

This 1950s RCA represents a highly interesting choice for those who desire a 12AX7 with an authentic vintage character, solid construction, and high performance.

The VERY STRONG test on Amplitrex and the Low Noise & Microphonics verification guarantee stable and reliable operation, making it suitable even for critical circuit positions.

A tube that combines history, construction, and musicality, designed for those who seek not just performance, but a true listening experience.

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 = 1500 ; Ia = 0.9 mA
  • Section 2: Gm = 1500 ; Ia = 0.9 mA

Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.
  • Balance: Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational.
  • Aesthetic condition: Sufficient – Labels completely worn off. See photos for details.

Manufacturing Code:

  • indecipherable, identifiable by construction characteristics. 1950s

Discover why our tubes are different →

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.