USA 5Y4G (Vintage NOS)


Vintage NOS USA 5Y4G Rectifier Tube

Unlock the Classic American Tube Sound

Discover the essential component that shaped the iconic guitar tones of the past. This New Old Stock (NOS) 5Y4G rectifier tube hails from the golden age of American tube manufacturing, crafted by legendary brands like Sylvania, GE, Tung-Sol, and others.

Why Choose a NOS USA 5Y4G?

    • Authentic Vintage Tone: Capture the warmth, sag, and dynamic response that defined classic rock, blues, and country guitar sounds.
    • Superior Build Quality: American-made NOS tubes are renowned for their robust construction and long lifespan.
    • The Joy of Variety: Each manufacturer imparted subtle sonic nuances – experiment to find your perfect flavor!
    • Hand-Selected & Tested: We guarantee the performance and authenticity of every tube.

Key Features of the 5Y4G

    • Full-Wave Rectifier: Essential for converting AC power to DC for your amplifier.
    • Octal Base: Fits most classic American amplifier designs.
    • 5V Heater Voltage: Ensure compatibility with your amp's specifications.

Experience the Difference

A NOS USA 5Y4G rectifier offers:

    • Improved Touch Sensitivity: Your playing dynamics shine through with greater detail.
    • Rich Harmonic Content: Adds complexity and depth to your tone.
    • Timeless Reliability: Enjoy worry-free performance for years to come.

Upgrade Your Amp Today!

Breathe new life into your vintage amp, or add authentic vintage character to modern amps designed with 5Y4G compatibility.

Note: Let us know if you have a specific amp in mind, and we'll help ensure compatibility.

The Fuzz Audio Guarantee:

We stand behind the quality of our NOS tubes. That's why we offer a one year warranty to ensure your satisfaction.

Need help deciding what tubes are best for you?

Use our plate cheat sheet and vacuum tube buyers guide to determine which tubes are best for you. Likewise, you are welcome to reach out to us directly at or by using our chat located on our shop page if you have further questions.

NOS vs. ANOS vs. Test NOS

These designations are strictly used to describe the cosmetic condition of our tubes. All tubes we sell test identically, come with 100% life and are guaranteed to work in your device!

If you are picky about owning an original box or wanting a specific logo please reach out to us before purchasing.

  1. NOS (New Old Stock) Tubes- are 100% brand new vintage tubes in mint cosmetic condition with show zero signs of use. You should expect a legible logo and clean straight pins. An original box is likely but not guaranteed. 
  1. ANOS Tubes- otherwise known as “almost new old stock” tubes are basically new, but may show slight signs of use in cosmetic condition, such as a missing logo or slightly bent pins. An original box is possible but unlikely. 
  1. Test NOS Tubes- are used but still operating to specification with 100% life. These tubes are equal in function to NOS valves, yet they cost considerably less because they have cosmetic blemishes. If you plan to disappear your tubes into the back of an amplifier or do not care what the tubes look like, then this is cost effective choice. Blemishes and cosmetic imperfections do not affect tone…

Logos: Vintage tubes have a wide variety of logos printed on them. It is not uncommon to see a Mullard made tube with an RCA or GE logo, or a GE made tube with a Mullard logo. Your tube may come with a logo such are Heath Kit, Baldwin, Fisher, Hammond, Magnavox, Fender, Gibson, Silvertone, etc. but the true manufacturer of that tube will be correct to your order. If you are looking for a specific logo please reach out before purchase.

Our Standards:

  • All tubes are tested for microphonics and are guaranteed to work in sensitive audio applications
  • All tubes sold are guaranteed to have strong (to spec) NOS test scores with 100% life
  • All tubes are tested on a calibrated Hickok 539C, Maxi-Matcher, E-Tracer or other industry standard tube analyzers
  • Tubes are guaranteed for one year and can be returned within 30 days
  • Preamp tubes matched by gain and mutual conductance (Gm)
  • Power tubes matched by mA and Gm

Don’t forget to email or reach out to us via chat if you need help picking out valves for your device.

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