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RCA

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

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

495,00 DKK
495,00 DKK
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12AX7 / ECC83 RCA – Long Gray Plates – Square Tilt Getter – Made in USA '50s

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics

Description:

This original RCA 12AX7 / ECC83, made in the United States in the 1950s, represents one of the most sought-after versions of the famous American double triode, appreciated for its build quality and its distinctive sonic character.

The internal structure highlights elements typical of the best RCA productions of the time:

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

The square tilt getter is a characteristic configuration of the first productions, today particularly appreciated for its vacuum stability and longevity.

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

Sound Characteristics

This RCA 50's configuration offers a typically warm, full and three-dimensional sound, with an extremely natural musical presentation.

Bass: Deep and rounded, with excellent structure and body. Never intrusive, but always well controlled.

Mids: The real strength: rich, textured, and incredibly expressive. Vocals are present, credible, and nuanced.

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

Dynamics: Fluid and natural, with a musical response that prioritizes 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 (due to low noise)
  • quality buffer and line stage

Perfect for systems requiring musicality, naturalness and realistic harmonic reconstruction , with a typically “American” sound signature.

🎸 Use in Music Applications

Also highly appreciated in the instrumental field for:

  • guitar amplifiers
  • vintage organs and instruments

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

🎯 Note for audiophiles

This 50's RCA represents a very interesting choice for those who want a 12AX7 with authentic vintage character , solid construction and high performance.

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

A valve that combines history, construction and musicality , designed for those seeking not only 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

Valve:

  • Section 1 : Gm = 1600; Ia = 0.8 mA
  • Section 2 : Gm = 1800 ; Ia = 1.0 mA

Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections present a coherent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.
  • Output Quality: Excellent – ​​Very 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 – Writing completely faded. See photos for details.

Manufacturing Code:

  • Unreadable, identifiable by construction features. 1950s

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.