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National Union

5Y3GT 5Z2P NU National Union – Black Plates Square Getter Rectifier Tube USA 1950s

5Y3GT 5Z2P NU National Union – Black Plates Square Getter Rectifier Tube USA 1950s

£22.00 GBP
£22.00 GBP
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5Y3 GT ( 5Z2P ) NU National Union NOS Black Plates Square Getter Tube Rectifier Made in USA '50s

Description:

The 5Y3GT (5Z2P) NU National Union Black Plates Square Getter rectifier, made in the USA in the 1950s , is a tube prized for its ability to provide smooth, natural rectification , influencing the amplifier's response with well-regulated voltage and stable current delivery.

  • Bass : Smooth and controlled, with good articulation that ensures clean reproduction without excessive bloating.
  • Mids : Natural and slightly warm, with a smooth presentation and excellent tonal coherence , making the sound enveloping and musical.
  • Highs : Harmonious and never aggressive, with a pleasant extension that preserves detail without introducing listening fatigue.
  • Dynamics : Smooth and progressive , with excellent transient management that gives a touch of vintage musicality to the overall sound.

The NU National Union Black Plates from the 50s are sought after for their sturdy construction and smooth, linear rectification , making them ideal for both hi-fi amplifiers and vintage guitar amplifiers , where a well-regulated, slightly compressed voltage contributes to a warm, musical sound.

Test Results:

Valve tested on Funke W19 Tube Tester:

  • Test Conditions: Va = 100V ; Vf = 5V
  • Average 100%: Ia = 77.5 mA
  • Test Result: VERY STRONG

Valve:

  • Section 1: Ia = 75 mA
  • Section 2: Ia = 82 mA
Additional Tests Performed:
  • Microphonics: Standard. Tested and compliant 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: Vintage - Tested and working - In our custom box.
  • Functionality: Fully functional.
  • Aesthetic conditions: Very Good – Clearly legible writing with minor signs of erosion. Very small surface crack on the base, barely noticeable and with no impact on operation. See photo.
  • Manufacturing Code: JC

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.

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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.