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RCA

12AX7 / ECC83 RCA Long Black Plates Square Tilt getter Balanced Low Noise & Mic USA '58

12AX7 / ECC83 RCA Long Black Plates Square Tilt getter Balanced Low Noise & Mic USA '58

37.200 HUF
37.200 HUF
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12AX7 / ECC83 RCA – Long Black Plates – Square Tilt Getter – Made in USA ’58

AMPLITREX Tested – Balanced Sections – Low Noise & Microphonics – Vintage American Black Plates

Description

12AX7 / ECC83 RCA tube, Made in USA 1958 production, selected for compatible hi-fi and musical applications where vintage American sound character, low noise, and good internal consistency are required.

The construction with Long Black Plates and rare Square Tilt Getter identifies one of the most fascinating RCA configurations of the late 1950s, highly appreciated for its musicality, harmonic richness, and strong sonic personality.

The tube is used, carefully tested in our laboratory using the Amplitrex AT-1000 Tube Tester, with balanced sections and classified Low Noise & Microphonics.

Aesthetically, it is in good condition for its age: the RCA silkscreen is partially eroded but still legible, while the internal structure retains all the charm of authentic 1950s American black plates. See photos for details.

Sonically, it offers a broad, rich, and musical performance, with full and natural bass, material and harmonically dense mids, and fluid, never aggressive highs. The overall character is warm, engaging, and refined, typical of the best vintage RCA long black plates.

Suitable for hi-fi preamplifiers, line stages, compatible phono stages, integrated amplifiers, driver stages, vintage amplifiers, boutique amplifiers, and circuits compatible with 12AX7 / ECC83.

An RCA 12AX7 / ECC83 Long Black Plates from 1958 truly tested by Vacuum Tubes Treasures, ideal for those seeking an authentic, quiet, balanced vintage American tube with a rich and natural sound 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: GOOD

Tube:

  • Section 1: Gm = 1100 ; Ia = 0.8 mA
  • Section 2: Gm = 1100 ; Ia = 0.8 mA

Additional Tests Performed

  • Microphonics: Low Noise & Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.
  • Noise: Low and well-controlled. Quiet operation in hi-fi and musical amplifiers in the intended positions.
  • Emission Quality: Strong – Strong and regular emission, suitable for any application.
  • Shorts and GAS: Absent.

Conditions

  • Condition: Vintage Tube – Tested and perfectly functional. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Cosmetic condition: Good – Lettering partially eroded but still legible. Tube body in good condition. See photos for details.

Manufacturing Code: 58-09 → RMA/EIA Open Date Code → manufactured in the 9th week of 1958 → Radio Corporation of America, Camden, N. J.

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
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.