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DUMONT

5V3 ( 5AU4 ) DUMONT NOS NIB Black Plates Double Halo Getter - Amplitrex Tested - Tube Rectifier Made in USA

5V3 ( 5AU4 ) DUMONT NOS NIB Black Plates Double Halo Getter - Amplitrex Tested - Tube Rectifier Made in USA

€48,00 EUR
€48,00 EUR
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5V3 (5AU4) DUMONT NOS NIB Black Plates Double Halo Getter – Tested Tube Rectifier – Made in USA

Description:
The Dumont 5V3 (5AU4) is a full-wave rectifier tube manufactured in the United States during the 1940s–1950s.
Although branded Dumont, this specimen was actually produced by Sylvania, one of the most renowned American manufacturers of that era.
It comes in NOS NIB (New Old Stock – New in Box) condition, featuring black plates and the rare double halo getter system – a configuration that ensures robustness and long operational life.
The tube has been carefully tested on the Amplitrex AT-1000, measuring strong and fully efficient.

Tonal Characteristics and Sonic Behavior

Bass: Deep, tight, and well-controlled, with no unwanted boominess. Provides stability across the entire audio spectrum.

Midrange: Transparent and natural, delivering excellent timbral accuracy on vocals and acoustic instruments.

Highs: Extended and smooth, bright but free of harshness, with a natural decay that brings air and openness to the soundstage.

Dynamics: Fast and coherent, capable of handling both micro-details and complex peaks with confidence.

Soundstage: Stable and three-dimensional, with good instrument separation and a clearly perceptible “black background.”

🎧 Use in Hi-Fi Amplifiers

An excellent choice as a rectifier in high-end stereo amplifiers and preamplifiers.
Its stable power delivery translates into greater detail, transparency, and musical coherence.

🎸 Use in Musical Instrument Amplifiers

Also well-suited for vintage instrument and organ amplifiers, where it ensures reliable, quiet current delivery along with a robust and dynamic sound.

🎯 Note for Audiophiles and Technicians

The Dumont 5V3 (5AU4) Black Plates with double halo getter, manufactured by Sylvania, is considered one of the finest versions of this series.
Its combination of electrical ruggedness and musical sonic performance makes it ideal both for vintage equipment restoration and for use in high-level hi-fi systems.
This specimen is offered as NOS NIB and Amplitrex Tested, ensuring reliable performance and long service life.

Test Results

Tubes tested on Amplitrex AT-1000 Tube Tester:

  • Test Conditions: Va = 278V, Vf = 5V
  • Forward Voltage Drop: 20–21 V peak (balanced sections)
  • Reverse Leakage: 396–396 V peak (excellent)
  • Test Result: VERY STRONG

Plate Current:

  • Section 1: Ia = 120 mA    
  • Section 2: Ia = 120 mA

Additional Tests:

  • Microphony: Standard. 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.

Condition

  • Condition: NOS – NIB – New Old Stock, New in Box – Tested and working – Supplied in its original box.

  • Functionality: Fully operational.

  • Cosmetic Condition: Excellent – Markings well preserved, minimal signs of age. See photos for details.

  • Manufacture Code: 312 6-31 – Produced by SYLVANIA in July 1946.

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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  • 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.

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