2 National Union 6SL7GT VT-229 | NOS Matched Pair

National Union 6SL7GT/VT-229 Smoked Black Plate Vacuum Tube

Unlock Superior Audio Fidelity

Introducing the National Union 6SL7GT/VT-229, a vacuum tube that represents the epitome of audio perfection. Crafted by a manufacturer renowned for its contribution to the golden age of audio, this tube is designed for those who demand nothing but the best in sound quality and reliability.

Key Features:

  • Exceptional Audio Clarity: Delivers an unmatched listening experience with its ability to produce clear, warm, and richly detailed sound.
  • High-Quality Construction: Manufactured to exacting standards, ensuring robust performance and long-lasting durability.
  • Wide Application Range: Ideal for use in high-end audio equipment, including tube amplifiers, hi-fi stereo systems, and vintage audio restorations.
  • Rare and Sought-After: The VT-229 designation marks this tube as a rare find, highly prized by collectors and audio enthusiasts alike.
  • Historic Pedigree: With National Union's legacy of excellence, this tube is a piece of audio history, offering both performance and collectible appeal.


  • Type: Dual Triode
  • Base: Octal (8-pin)
  • Filament Voltage: 6.3V
  • Maximum Plate Voltage: 250V
  • Amplification Factor: 70

Ideal For:

  • Audiophiles and collectors seeking rare, high-quality tubes
  • Musicians and audio professionals aiming to upgrade their sound
  • Vintage audio equipment enthusiasts and restorers

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 Support@FuzzAudio.com 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 Support@fuzzaudio.com or reach out to us via chat if you need help picking out valves for your device.

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