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Groove Tubes

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These Groove Tubes Gold Series GT-6L6-R Matched Power Tubes are Russian made, same as the 5881, but matched in the GT system. These are a very sturdy and reliable tube, with slightly less power and a more aggressive edge when pushed into distortion.

These are the tubes that are used by Fender in amps that use 6L6 tubes and DO NOT come from their Custom Shop. These are used in the Hot Rod series, Blues DeVille series, Pro Tube series, BF reissue series.

The GT 6L6GE is used in the 57 Tweed, Vibroverb and Vibro King amps.

If you are trying to match your stock tube rating with the GT rating:

On Fender amps, output tubes in newer amps are color coded. The scale is:

Blue = GT 1-3 rating
White = GT 4-7 rating
Red = GT 8-10 rating

Low, medium, and high style descriptions refer to break up modes of the tube for an overdriven guitar signal. High-rated tubes break up slow and have the highest amount of headroom, while low-rated tubes break up easier and have the least headroom, yielding a heavier, harder distortion. Medium-rated tubes fall in between.
Groove Tubes Gold Series GT-6L6-R Matched Power Tubes Medium (4-7 GT Rating) Duet

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Country of origin: Russia

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4.2

5 Reviews

50%

of respondents would recommend this to a friend

Filters
Best Uses
  1. Concerts1
  2. Practicing1
Cons
  1. Hilariously microphonic1
  2. Not Functional1
  3. Overpriced1
  4. Poor Quality1
Describe Yourself
  1. Professional Musician2
Pros
  1. Easy To Use2
  2. Functional1
  3. Good Quality1
  4. Improves Sound1

Reviewed by 5 customers

  • Sonically bland, yet microphonic

    1

    submitted3 years ago

    byLee

    fromUSA

    Never cared for Sovteks (what these are), as they have all the sonic character of a potato buried in Siberian permafrost, but I've never had a bad one out of the box. Picked up a matched pair that GT rebranded and "tested" at an upcharge to find one was wildly microphonic. Yikes.

  • Groovy

    5

    submitted6 years ago

    byRay Ray

    fromSt. Louis momo

    I need replacement tubes for my Traynor 80watt amp so I got the 6L6 equivalent tubes sounds awesome, great clear and mellow tones and the break up starts at a decent volume.

  • Cleaned Up My Hot Rod Deluxe III

    5

    submitted13 years ago

    byRon Lucas

    fromCastle Rock, CO

    I purchased the Fender Hot Rod Deluxe III knowing it had a clean channel and dirty channel. I use pedals into the amp through the clean channel, but at volumes higher than 3 or 4 on the amp, it would start to break up. I called Fender who confirmed the stock tubes are rated between 4 and 7 which break up that early. So they recommended these tubes rated between 8 and 10. I got the 10. After installing and learning how to re-bias the amp on YouTube, the amp plays very clean when cranked up to 8. Works as expected.

  • Once you go G, you never go B.

    5

    submitted14 years ago

    byChris

    fromColumbus, OH

    I use a 7 rating in my Mesa Dual Rectifier and they sound phenomenal. I've had the same pair in for about 2 years through a LOT of touring, and i'm just NOW starting to see a difference in tone and quality. I play more of a pop/rock style and these tubes help really fill out the mix on stage. They are so versatile! i can have a great low gain tone for a more indie sound, but also a great heavy sound for the hard breakdowns. I definitely recommend these. These tubes along with the GT Russian Preamps, great combo!

  • Great product

    5

    submitted15 years ago

    byLightning scott

    fromIndiana

    I'm an old 80s heavy metal guy.I've used sovtek tubes for years the night before a gig I blew a tube so I went to guitar center for some replacement all they had were groove tubes(wasn't sure about them heard some so so things about them)so I bought them. I got say that I'm very impressed the tube are so warm sounding in my jcm900 Marshall it blew my doors away don't know why people talk bad on these tubes I would highly recommend them!

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Have a question about this product? Our expert Gear Advisers have the answers.

  • submitted5 months ago

    asked byHKRichter

    fromAsheville, NC

    Does Fender still test for microphonics on its Groove Tubes?

    Does Fender still test for microphonics on its Groove Tubes?

    Open Reply - Gear-Support
    I’m sorry, I don’t know.

  • submitted2 years ago

    asked byGreg

    fromMacon, Georgia

    I have a Fender Vibrolux Reverb amp. It has two GT-6L6-S power tubes. Can I use the GT-6L6-R matched tube set for this amp ?

    I have a Fender Vibrolux Reverb amp. It has two GT-6L6-S power tubes. Can I use the GT-6L6-R matched tube set for this amp ?

    Open Reply - Thomas
    Yes

  • submitted2 years ago

    asked byMary

    fromLafayette, LA

    How many tubes are in this. Is it a kit?

    How many tubes are in this. Is it a kit?

    Open Reply - Thomas
    Two

  • submitted3 years ago

    asked bychristopher

    fromSanta Rosa Ca

    Is this price for a matched pair or for a single tube?

    Is this price for a matched pair or for a single tube?

    Open Reply - Thomas
    Just the one.