5V4G GZ32 SILVERTONE ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '51

5V4G GZ32 SILVERTONE by Sylvania ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '51

Description:

The Silvertone-branded 5V4G/GZ32 , produced in 1951 by Sylvania for the audio line of Sears, Roebuck & Co. , features the classic ST bottle structure, well-machined vertical black plates and square getter at the bottom . It is one of the most musical and transparent versions of the first post-war generation American rectifiers.

Prized for its combination of electrical robustness , tonal refinement and natural current decay , this valve is particularly suited to high-sensitivity systems , high-end hi-fi restorations or driver stages where the quality of the rectification is directly reflected in the dynamic response and articulation of the audio signal.

Bass : elegant and natural. The low range is distinguished by roundness and coherence , with a response that favors harmony rather than impact. There is no compression or swelling, but an “analog” presence that enriches the musical base with warmth and depth.

Mids : velvety and musical. The mid frequencies are the strong point of this 5V4G, with a soft, fluid and refined performance. The voices are warm and present , with an emotional texture that recalls the sound of 50s hi-fi systems, but without loss of definition.

Highs : soft and airy. The high range extends delicately and without grain , offering a discreet brilliance and a feeling of airiness that accompanies listening without tiring. Excellent rendering of secondary details, particularly in reverberations and natural harmonics.

Dynamics : progressive and not aggressive. The transient response is gradual and controlled , with an expressive and natural microdynamics. The behavior is musical , closer to a European GZ32 than to an aggressive American rectifier.

Soundstage : extended and deep. The soundstage opens with fluidity and coherence , offering an orderly three-dimensional image, with excellent separation of the planes and realistic presence of the recording environments .

🎧 Use in Headphone Amplifiers and Driver Stages Hi-Fi
An excellent choice for low-current tube power supplies, high-end preamps or tube DACs, where tonal finesse and low noise are essential. Ideal with reference headphones that value signal delicacy , such as the ZMF Verité , Audeze LCD-4 or Audio-Technica ADX5000 .

🎸 Use in Guitar and Bass Amplifiers
Less common in guitar, but perfect in low-power amps or vintage studio circuits , where you want a smooth sag , natural compression and a sweet attack. Great for jazz, fingerstyle, nuanced cleans and organic vintage tones.

🎯 Note for audiophiles and technicians
A refined rectifier with a romantic soul , which combines the aesthetic charm of the ST shape with the sweet and musical voice typical of vintage Sylvania production. Ideal for author restorations, low-power systems and lovers of transparency without harshness .

Test Results

Tubes Tested on Funke W19 Tube Tester:

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

Valve :

• Section 1 : Ia = 70 mA
• Section 2 : Ia = 70 mA

• Microphonics: Low Noise & Microphonics – Tested and rated for use in hi-fi systems and guitar amplifiers.
• Output Quality: Excellent – Very strong and stable output, no fluctuations.
• Short circuits and GAS: Absent.

Conditions:

• Condition: Vintage Tubes - Tested and in perfect working order. Supplied in our custom box for optimum protection.
  
• Functionality: Fully functional.
  
• Cosmetic Condition: Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.
  
• Manufacturing Code: 312 152 - Manufacturing SYLVANIA USA. 52nd week of 1951.

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