5Y4G HYTRON Black Plates Square Getter Rectifier Tube Made in USA 1951

5Y4G HYTRON Black Plates Square Getter Rectifier Tube Made in USA 1951

Description:

The 5Y4G HYTRON , produced in 1951 in the United States and characterized by black plates , square getter and robust ST bottle structure, is a directly heated rectifier designed for low power and low consumption audio applications, electrically compatible with the 5Y3G (but with different pinout). HYTRON, a historic American company specialized in high quality military and civilian valves, stands out in this creation for its construction precision, operational silence and relaxed musicality .

It is particularly suitable for use in tube preamplifiers , small single-ended amplifiers or restored vintage radios , where a stable output voltage , a gradual start and a transparent but not analytical sound reproduction are desired.

Bass : smooth and well integrated. The low range is rounded and controlled , without exuberance but never weak. Perfect in systems where a harmonious and musical bass is preferred rather than impactful.

Mids : Warm and natural. The mids are the strong point of this tube: full central voice, rich harmonics and delicately rendered acoustic instruments . The timbre is organic and coherent , without excess.

Highs : soft and refined. The high range develops with attenuated brilliance , maintaining air and detail but without ever being aggressive or dry. Excellent for prolonged listening in controlled environments.

Dynamics : smooth and gradual. Transient behavior is soft , with a fluid and natural response , ideal in applications where musicality and harmonic progression are required, rather than a strong attack.

Soundstage : intimate and well structured. The stereo image is focused , with a credible depth and a good separation of the sound planes . It does not tend to artificially widen the scene, but favors immersive and centered listening .

🎧 Use in Headphone Amplifiers and Driver Stages Hi-Fi
Thanks to its low noise emission , smooth and stable voltage and quality mechanical construction, this 5Y4G HYTRON proves to be perfect for powering DACs, preamplifiers and tube driver stages . It pairs successfully with high-efficiency reference headphones such as the Audio-Technica ADX5000 , ZMF Auteur or Sennheiser HD580 , where it enhances transparency and naturalness .

🎸 Use in Guitar and Bass Amplifiers
Although not very widespread in the guitar field, it is used in low-wattage combos or handcrafted amps with soft power supplies , where it delivers a compressive, soft and musical sound, with an excellent response to the touch and a progressive saturation with an authentically vintage flavour.

🎯 Note for audiophiles and technicians
A balanced and quiet rectifier, ideal for high-end restorations , custom applications or for those who want a non-fatiguing audiophile voice . The 1951 HYTRON version, with black plates and a square getter , represents a solid and refined choice for low-power systems where the quality of the rectification directly influences the overall musical character.

Test Results:

Valve tested on Funke W19 Tube Tester:

• Test Conditions: Va = 100V ; Vf = 5.0V
• Average 100%: Ia = 92 mA
• Test Result: VERY STRONG

Valve:

• Section 1: Ia = 75 mA
• Section 2: Ia = 80 mA

• 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 Tubes - Tested and in perfect working order. Supplied in our custom box for optimum protection.
  
• Functionality: Fully functional.
  
• Aesthetic Condition: Very Good – Clearly legible writing with slight signs of aging, missing code on glass. See photos for details.
  
• Manufacturing Code: 51-43 - Manufactured 43rd week of 1951.

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