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2 Sylvania 6SL7GT | NOS NIB | Matched Pair

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2 Sylvania 6SL7GT  Vacuum Tubes 

Matched Pair, Black Plates

We have a few pairs available and they all will match with each other. If you need 4 matched tubes, simply buy 2 pairs!

One tube is NOS NIB!

Test Results:

Tube 1: 60\60

Tube 2: 60\60

NOS = 55+

Matched = +/-10

Sylvania 6SL7GT High-Performance Vacuum Tube

Elevate your audio experience with the Sylvania 6SL7GT, a high-performance vacuum tube that stands out for its exceptional audio fidelity and reliability. Designed to meet the needs of audiophiles and professional musicians alike, this tube delivers a superior sonic experience, enhancing the overall warmth and depth of audio systems.

Key Features

  • Superior Sound Quality: Delivers a rich, detailed audio experience, characterized by its warm bass, clear mids, and crisp highs.
  • Robust Reliability: Built to high manufacturing standards, ensuring consistent performance and durability across various audio applications.
  • Wide Compatibility: Perfectly suited for use in a range of audio equipment, including guitar amplifiers, hi-fi systems, and professional audio gear.
  • Enhanced Audio Dynamics: Provides an improved tonal balance, offering a harmonious blend of frequencies for a fuller audio experience.
  • Glass Envelope: Encased in a durable glass envelope, ensuring longevity and maintaining sound integrity.


  • Type: Dual triode
  • Base: Octal (8-pin)
  • Filament Voltage: 6.3V
  • Filament Current: 300mA
  • Plate Voltage (Max): 250V
  • Amplification Factor: 70


  • High-Fidelity Audio Systems
  • Professional Studio Equipment
  • Guitar and Bass Amplifiers
  • Vintage Audio Equipment Restoration

Customer Reviews

The Sylvania 6SL7GT receives high praise for its ability to enhance the sonic quality of audio systems, noted particularly for its depth and warmth. Its reliability and durability also make it a popular choice among audio enthusiasts and professionals seeking to achieve a superior sound quality.

Purchase Information

  • Availability: Available at select audio equipment stores and online retailers specializing in vintage and high-quality audio components.
  • Pricing: Prices may vary based on availability and demand. Contact authorized dealers for the most current pricing and availability information.
  • Warranty: Specific warranty terms may vary by retailer. Customers are encouraged to verify warranty information at the time of purchase.


The Sylvania 6SL7GT is an exemplary choice for anyone looking to upgrade their audio system's performance. With its superior sound quality, reliability, and wide compatibility, it serves as an essential component for audiophiles, musicians, and audio professionals. Whether you're refining your home audio system, professional studio setup, or restoring vintage equipment, the 6SL7GT offers a timeless sound that truly stands out.

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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