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SYLVANIA

5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s

5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s

€19,90 EUR
€19,90 EUR
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5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s

Description:

This 5963 (12AU7 / ECC82) SYLVANIA , produced in the USA in the 1950s, represents one of the most refined and technically sound interpretations of the vintage American 12AU7.
The construction with long plates and halo getters is typical of high-quality Sylvania productions, appreciated for the balance between operational reliability, sonic transparency and linear behavior over time.

Tested and selected valve, with stable emission and low background noise, designed for hi-fi and professional audio applications where coherence, control and musicality without excesses are required.

  • Bass: Precise and well-controlled. The low range is dry, uncluttered, and free of artificial emphasis, favoring clarity and rhythmic articulation.
  • Mids: Open and natural. Voices and acoustic instruments are well-proportioned, with a clean, clear reproduction, typically Sylvania: less "warm" than RCA, but more neutral and transparent.
  • Highs: Clear and well-extended. The high end is airy and defined, without harshness, with elegant detail that doesn't tire the listener.
  • Dynamics: Balanced and smooth. The response is prompt but composed, ideal for line stages, drivers, and signal control sections.
  • Soundstage: A tidy and well-focused scene. Correct separation of sound planes and a stable image, with a realistic and coherent presentation.

🎧 Use in Hi-Fi Stereo Amplifiers

Ideal for:

  • preamplifiers and line stages
  • buffers and coupling circuits
  • Vintage and modern hi-fi amplifiers compatible with 12AU7 / 5963

Particularly suitable for non-critical or moderate gain positions , where operational stability, low overall noise and timbral coherence are required.

🎸 Use in Musical Instrument Amplifiers

Suitable for:

  • driver positions, phase inverter or V2 / V3
  • guitar and bass amplifiers
  • applications in studio and professional contexts

It offers reliable, controlled operation, with low noise and predictable response.
It is recommended to avoid using it in V1 or in very high gain stages , where specifically selected low-noise tubes are preferable.

🎯 Note for audiophiles and technicians

A well-built and well-tested 1950s Sylvania 5963 , designed for those looking for neutrality, control and reliability , with the classic American approach that is more linear and transparent than its “warmer” counterparts.
A rational and musical choice for hi-fi systems and professional applications.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -8.5V
  • Average 100%: Gm = 2200 ; Ia = 10.5 mA
  • Test Result: VERY STRONG

Valve:

  • Section 1: Gm = 2200 ; Ia = 9.4 mA
  • Section 2: Gm = 2100 ; Ia = 8.4 mA
Additional Tests Performed:
  • Microphonics: Microphonics and Noise: Very Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
  • Balance: The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.
  • Output Quality: Excellent – Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: Vintage - Tested and working - Comes in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Cosmetic condition: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.
  • Manufacturing Code: Unreadable – Made by SYLVANIA USA, 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
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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.