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SYLVANIA

12AX7 / ECC83 Sylvania Long Black Plates Foil Getter Amplitrex Tested Tube USA 1950s

12AX7 / ECC83 Sylvania Long Black Plates Foil Getter Amplitrex Tested Tube USA 1950s

21.900 HUF
21.900 HUF
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12AX7 ( ECC83 ) SYLVANIA Long Black Plates Foil Getter AMPLITREX Tested Tube MADE IN USA '50s

Description:

This 12AX7 / ECC83 SYLVANIA, Made in USA 1950s production, represents one of the most appreciated configurations of the historic American small signal tube production.

The construction with Long Black Plates and characteristic Foil Getter identifies a type highly sought after today by vintage electronics enthusiasts for its build quality, historical charm, and sonic personality.

This is a used tube, carefully tested and selected in our laboratory using an AMPLITREX AT-1000 Tube Tester.

Sylvania productions with long black plates have always been appreciated for their ability to combine musicality, balance, and naturalness, while maintaining that typical American sound signature that made the best tubes of the era famous.

From an aesthetic point of view, the tube retains the authentic charm of 1950s vintage productions, with the characteristic internal structure of long black plates that continues to attract the interest of audiophiles, technicians, and collectors today.

Sonic Characteristics

The 12AX7 Sylvania Long Black Plates are generally appreciated for an balanced, natural and harmonically rich sound presentation.

Their sound signature tends to favor fluidity, tonal accuracy, and a remarkable ability to reproduce the musical message in a credible and engaging way.

Bass

The bass range is well controlled and natural, with a good sense of solidity and a consistently orderly and musical presentation.

Mids

The mids represent one of the strengths of this production. Vocals are credible and well-focused, while acoustic instruments and harmonics maintain a rich and pleasing texture.

Highs

The high range is fluid and well integrated into the overall sound context. Detail is present without being artificial, favoring prolonged and relaxed listening.

Dynamics

The dynamic response is natural and progressive, with a good ability to follow musical variations while maintaining coherence and control.

Soundstage

The soundstage appears stable and well organized, with correct instrument separation and a credible spatial presentation.

🎧 Use in Hi-Fi Amplifiers

This SYLVANIA ECC83 / 12AX7 is particularly suitable for:

  • hi-fi preamplifiers
  • line stages
  • compatible phono stages
  • vintage and modern integrated amplifiers
  • compatible driver stages

The Low Noise selection makes it particularly interesting for applications where quietness and tonal naturalness are important characteristics.

🎸 Use in Musical Applications

In the field of musical instrument amplifiers, Sylvania Long Black Plates are highly valued for their balanced and musical character.

This tube offers:

  • good harmonic response
  • natural and well-present mids
  • progressive dynamic behavior
  • contained noise
  • authentic vintage character

Characteristics that make it interesting for both vintage amplifiers and compatible boutique creations.

🎯 Note for audiophiles and technicians

This 12AX7 / ECC83 SYLVANIA Long Black Plates Foil Getter Made in USA 1950s represents a remarkable American vintage selection for those who desire a true vintage ECC83 with:

  • Long Black Plates construction
  • Foil Getter
  • Low Noise
  • well-balanced sections
  • typical musicality of vintage American production

The internal VTT classification is VERY STRONG, with a regular electrical profile, stable emission, and well-aligned sections.

A tube that retains the authentic charm of the best Sylvania productions of the golden age, selected according to Vacuum Tubes Treasures standards.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 1.2 mA
  • Test Result: VERY STRONG

Tube :

  • Section 1: Gm = 1500 ; Ia = 1.0 mA
  • Section 2: Gm = 1400 ; Ia = 0.9 mA
Additional tests performed:
  • Microphonics: Low. Tested and suitable for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • 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.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Condition:

  • Condition: Vintage - Tested and functional - Provided as shown in photos. 
  • Functionality: Perfectly operational.
  • Aesthetic condition: Sufficient – Writings completely disappeared. See photos for details.
  • Manufacturing Code: absent – SYLVANIA USA production, identifiable by constructive characteristics. 1950s

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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.