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RCA

5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58

5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58

€74,90 EUR
€74,90 EUR
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5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58

Description:

The 5V4G / GZ32 RCA, in this refined 1958 version with ST bottle, symmetrical black plates, and bottom square getter, represents one of the most balanced and musical options among classic American rectifiers for hi-fi applications. Built with the care typical of RCA’s golden years, it combines electrical robustness, low noise operation, and refined tonal performance.

Especially appreciated in systems with sensitive power supplies or vintage integrated amplifiers, this tube is ideal for those seeking stable voltage, smooth startup, and a sound output that preserves the natural character of the audio signal.

Bass: tight and extended. The low-end response is more precise and defined compared to other contemporary 5V4G models, with good hold even under dynamic load conditions. It delivers firm and musical bass, capable of authoritatively supporting the harmonic foundation.

Midrange: transparent and neutral. The mid frequencies are dry but not cold, with excellent vocal clarity and a natural rendering of acoustic instruments. No tonal coloration, just a clarity that enhances the system’s timbral coherence.

Highs: open and discreet. The top end extends with fineness and control, without harshness or roughness. Details emerge with refinement, revealing micro-information without ever becoming intrusive.

Dynamics: fluid and responsive. The tube tracks transients well, with energetic yet never edgy behavior. The dynamic response is linear and progressive, enhancing both delicate passages and those requiring more energy.

Soundstage: well-organized and deep. The stereo image is stable, centered, and coherent, with good layering and a three-dimensional presentation that respects the spatial integrity of the music.

🎧 Use in Headphone Amplifiers and Hi-Fi Driver Stages
Ideal for tube preamps, DACs with tube rectification, or headphone amps with medium-high impedance. Thanks to its electrical transparency and low noise emission, this tube performs without introducing coloration, enhancing detail and microdynamics even in reference-grade systems.

🎸 Use in Guitar and Bass Amplifiers
Occasionally used in mid-range American amps from the 1950s, this 5V4G contributes to a soft and musical sag, with a non-aggressive dynamic response. Ideal for jazz, blues, studio cleans, and genres that favor natural compression and controlled attack.

🎯 Note for Audiophiles and Technicians
A balanced and uncompromising tube, perfect for those seeking a rectifier that is transparent, stable, and technically flawless. The ST design with bottom square getter and symmetrical black plates also makes it a premium choice for vintage restorations, both sonically and aesthetically.

Test Results

Tube tested on Funke W19 Tube Tester:

Voltage Test: Va = 60V, Vf = 5V
Good from: Ia = 55 mA
100% Average: Ia = 84.6 mA
TEST RESULT: VERY STRONG

Tube Readings:

  • Section 1: Ia = 82 mA
  • Section 2: Ia = 80 mA
Additional Tests Performed:
  • Microphonics: Low Noise & Microphonics – Tested and suitable for hi-fi systems and guitar amps.
  • Emission Quality: Excellent – Very strong and stable emission, no fluctuations.
  • Shorts and GAS: None.

Condition:

  • Condition: Vintage tube – Tested and fully functional. Supplied in our custom box for optimal protection.
  • Functionality: Fully operational.
  • Aesthetic condition: Very Good – Legible print with minor signs of age, some smearing on the logo silkscreen. See photos for details.
  • Factory Code: K2 – RCA Manufacturing. March-April 1958.

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.