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Groove Tubes GT-12AX7-R2 Preamp Tube  

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A great choice for a phase inverter tube.

The Groove Tubes GT-12AX7-R2 Preamp Tube is the second offering from the Russian tube factory. It has larger plates and a big bass response, also a spiral filament which reduces hum in some amp designs.

These long plate tubes are a great choice for a phase inverter tube as well for fans of long plate phase inverters.

Country of origin: Russia


GT-12AX7-R2 Preamp Tube Specifications:

  • Country of origin: Russia
Customer Reviews

Review Snapshot®

by PowerReviews
Groove TubesGT-12AX7-R2 Preamp Tube

(based on 2 reviews)

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Reviewed by 2 customers

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High gain

By justaguitarplayer

from Louisville, KY.

About Me Experienced


  • Good Quality
  • High Gain
  • Improves Sound


  • None

Best Uses

  • For Rock And Metal

Comments about Groove Tubes GT-12AX7-R2 Preamp Tube:

My favorite preamp tube. High gain. Improves overdrive and distortion. With these you may find you no longer want a distortion or overdrive pedal. I'd also like to try the JJ ECC83S.

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(8 of 9 customers found this review helpful)


A Groovy preamp tube!

By Shred Fest

from Grand Rapids MI

Comments about Groove Tubes GT-12AX7-R2 Preamp Tube:

I play through a Dual Rec and have tried a few different brands of preamp tubes throughout the years. These tubes work great! I have over 10 hrs on these tubes now and I have only heard good things while using them. I have noticed less hum noise and better bass response. These tubes are more expensive but if tone is a priority then you can't go wrong with this purchase.

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