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SYLVANIA

5751 12AX7 ECC83 NOS Sylvania 💎 Gold Brand – Gold Pin Disc Getter Amplitrex Tested Tube USA

5751 12AX7 ECC83 NOS Sylvania 💎 Gold Brand – Gold Pin Disc Getter Amplitrex Tested Tube USA

€89,90 EUR
€89,90 EUR
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5751 ( 12AX7 ECC83 ) NOS SYLVANIA 💎 Gold Brand Gold Pin Disc Getter AMPLITREX Tested Tube MADE IN USA

Description:

The SYLVANIA 5751 Gold Brand is one of the most popular versions of this well-known low-gain double triode (about 70% of that of a 12AX7), selected in the Gold Brand series with gold-plated feet for professional, military, and broadcast applications. Equipped with a disc getter and carefully constructed internal structure, it offers a very refined, balanced, and quiet sound, ideal for both audiophile listening and for tonal control in critical environments.

The 5751's character is transparent and controlled , with a smoother response than a classic 12AX7, but without losing detail or musicality. It's often chosen to "calm down" overly aggressive preamp sections or to improve resolution in high-end tube amplifiers.

Bass : Dry and controlled, with good articulation. It lacks excessive emphasis, but ensures precision even on complex passages.

Mids : rich in harmonic content, but never intrusive. Voices sound natural, with good body and excellent intelligibility.

Highs : Delicate and clean, without harshness. They offer an airy but well-regulated extension, suitable even for prolonged listening.

Dynamics : Smoother and more progressive than a standard 12AX7, but very coherent. It delivers detail naturally, without artificial compression.

Soundstage : Wide and very focused, with depth and a well-defined presentation even on high-resolution systems.

A perfect tube for hi-fi preamplifiers, phono stages, tube DACs, or even as a strategic replacement for 12AX7 in systems or instruments where greater balance and definition is needed.

🎸 Use in Guitar and Bass Amplifiers

The SYLVANIA 5751 Gold Brand is also a popular choice in the guitar world, especially for those who want to slightly reduce the gain of a preamp stage for greater headroom, clarity, and articulation. Its sturdy construction and gold-plated feet make it extremely stable and quiet, perfect for live performance, recording, and high-sensitivity environments.

It is particularly suitable for musicians who want to make a very aggressive tube amplifier more manageable , maintaining tonal quality and improving dynamic control. In the clean channels it offers more space before saturation , while in the overdrive channels it allows you to maintain definition and reduce unwanted compression .

🔊 Ideal for musicians looking for :

  • Wider, brighter and less compressed cleans
  • Greater gain control in saturated channels
  • Smoother and more progressive response to touch
  • Silence and reliability even with complex effects or in the studio

🎸 Recommended amplifiers :

  • Fender Blues Junior / Hot Rod Deluxe – For improved gain control and more open cleans
  • Marshall DSL / JCM800 – Great for smoothing out the early stages and getting more control
  • Mesa/Boogie Dual Rectifier (Clean Channel) – More headroom and detail in the low end
  • Boutique amps (e.g. Two Rock, Matchless) – For those who want more nuance and fine dynamics

🎯 Note for musicians :
This tube is perfect for intelligently shaping your sound , reducing the harshness of dynamic peaks and delivering a more controlled and musical harmonic range , especially in the early pre-amp stages.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -3V
  • Average 100%: Gm = 1200 ; Ia = 1.0 mA
  • Test Result: VERY STRONG

Valve:

  • Section 1: Gm = 1000 ; Ia = 0.8 mA
  • Section 2: Gm = 1300 ; Ia = 1.1 mA
Additional Tests Performed:
  • Microphonics: Low. Tested and approved for use in hi-fi and guitar amplifiers.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.
  • Functionality: Fully functional.
  • Aesthetic condition: Very good – Legible writing with minor signs of aging, no obvious defects. See photos for details.
  • Manufacturing Code: Unreadable – Made by SYLVANIA USA, identifiable by its construction features. 1960s

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.