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INTERNATIONAL

5U4GB 5AS4A NOS NIB International by TOSHIBA Black Plates Tube Top Side Dual Disc Getter Rectifier Made in JAPAN

5U4GB 5AS4A NOS NIB International by TOSHIBA Black Plates Tube Top Side Dual Disc Getter Rectifier Made in JAPAN

$106.00 USD
$106.00 USD
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5U4GB 5AS4A NOS NIB International by TOSHIBA Black Plates Tube Top Side Dual Disc Getter Rectifier Made in JAPAN

Note: Price refers to one selected valve

Description:

The 5U4GB / 5AS4A , manufactured in Japan by Toshiba and distributed under the International brand, is offered in NOS NIB (New Old Stock, New in Box) condition.
This tube features black plates and a unique dual-disc getter system in the upper position , a typical feature of high-quality Japanese production of the time. It represents a highly reliable and consistent choice for high-end audio applications.

Timbre and performance characteristics

  • Bass : tight and compact, with excellent articulation and control.
  • Mids : clear and transparent, with voices and instruments rendered with realism.
  • Highs : bright and refined, never aggressive, with fine detail.
  • Dynamics : stable and proportionate, with constant power delivery even under load.
  • Soundstage : tidy, stable and precise, with a coherent sound image.

🎧 Use in Hi-Fi Stereo Amplifiers

Ideal as the main rectifier in reference hi-fi amplifiers (McIntosh, Dynaco, Audio Research, Conrad Johnson and similar), it offers silent and linear power supply, with excellent tonal coherence and great reliability over time.

🎸 Use in Music Amplifiers

In tube guitar amplifiers, the Toshiba 5U4GB delivers natural sustain, snappy response, and a warm harmonic tone—perfect for blues, jazz, and classic rock.

🎯 Note for audiophiles and technicians

This 5U4GB / 5AS4A Toshiba Black Plates Dual Disc Getter , in NOS NIB condition, represents a rare and valuable solution for those who want stable, long-lasting rectification with a refined sonic character, both in hi-fi and vintage music applications.

Test Results

Tubes Tested on Funke W19 Tube Tester:

Voltage Test: Va = 100V, Vf = 5V
Good from: Ia = 78 mA
Average 100%: Ia = 120 mA
TEST RESULT: VERY STRONG

Valve 1 :

  • Section 1 : Ia = 132 mA
  • Section 2 : Ia = 133 mA

Valve 2 :

  • Section 1 : Ia = 135 mA
  • Section 2 : Ia = 130 mA

Additional Tests Performed:
  • Operation: Stable valve, quiet in operation, and suitable for regular and controlled power supply. Tested with a Funke W19 tester.
  • Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
  • Short circuits and GAS: Absent.

Conditions:

  • Condition: NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.
  • Functionality: Fully functional.
  • Aesthetic condition: Very good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.
  • Manufacturing Code: Unreadable – Made by TOSHIBA JAPAN, identifiable by its construction features. 1970s

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.