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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

₩109,000 KRW
₩109,000 KRW
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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 →

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.

  • 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.