RCA 6SL7GT Smoked | NOS

RCA 6SL7GT Smoked Glass Vacuum Tube

**We have many of these available and not all tubes will come with original boxes. 

**Need a matched pair or quad? We always match when you purchase sets of 2 and 4 tubes!

Step into the realm of exceptional audio quality with the RCA 6SL7GT Smoked Glass vacuum tube, a hallmark of RCA's storied history in audio excellence. This tube combines the revered characteristics of RCA's manufacturing prowess with the unique aesthetic and acoustic properties provided by its smoked glass envelope, making it a coveted piece for audiophiles, musicians, and vintage audio enthusiasts alike.

Key Features:

  • Superior Sound Quality: Known for delivering crystal-clear, warm, and detailed audio, this tube enhances the listening experience by adding depth and character to music and audio recordings.
  • Unique Smoked Glass Design: The smoked glass not only adds a visually striking element to your tube collection but also serves to minimize internal reflections and microphonics, contributing to its superior sound quality.
  • Versatile Application: Excellently suited for use in a variety of audio equipment, including high-end tube amplifiers, hi-fi stereo systems, guitar amps, and vintage audio restoration projects.
  • Renowned RCA Reliability: With RCA's legacy in the audio industry, this tube is designed for lasting performance, ensuring reliability and consistency in all audio applications.
  • Collectible and Desirable: The combination of smoked glass and the RCA brand makes this tube highly sought after by collectors and those looking to add a piece of audio history to their setup.


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

Ideal For:

  • Audiophiles desiring to enrich their audio system with vintage warmth and clarity.
  • Musicians and audio engineers seeking to achieve a distinct, warm sound signature in their work.
  • Vintage audio equipment collectors and enthusiasts who value both aesthetic appeal and performance.

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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