Groove Tubes GT-12AX7-M Mullard-style Preamp Tube

Select Low-gain 12AX7 Guitar Preamplifier Tube Built to Mullard ECC83 Specifications
4/5 6 Write review Item ID: GT12AX7MSel
Groove Tubes GT-12AX7-M Mullard-style Preamp Tube image 1
Groove Tubes GT-12AX7-M Mullard-style Preamp Tube image 1
Sweetwater Savings: $5.00 MSRP: $24.99

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Groove Tubes GT-12AX7-M Mullard-style Preamp Tube
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Real Mullard-Style Tubes!

Note: all of the Groove Tubes tubes and sets we carry are "Mediums," or in the 4 to 7 range.

Finding real Mullard ECC83 preamp tubes is hard enough, but finding a consistent source of quality Mullard tubes is next to impossible. Lucky for you, Sweetwater has an excellent relationship with Groove Tubes, which makes it easy for us to supply you with GT-12AX7-M Mullard Select preamp tubes. This exquisite example of guitar preamp tube design at its finest uses the same mica and complex suspended cathode design as the tubes coveted by Hi-Fi amp lovers from the '50s to the '70s. With a set of GT-12AX7-M tubes in your amplifier, you'll experience vintage warmth and clarity like never before.

Groove Tubes GT-12AX7-M Mullard-style Select Guitar Preamplifier Tube Features:
  • A low-gain 12AX7 tube that's highly musical and harmonically rich
  • Drop-in replacements for real Mullard ECC83 amplifier tubes
  • Complex mica design uses shock-mounted cathode to enhance stability and sound quality
  • The perfect way to sweeten up the sound of your tube guitar amplifier
Spruce up your tired tube amp tone with Groove Tubes' GT-12AX7-M Mullard Select preamp tubes!

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Preamp
Model 12AX7
Manufacturer Part Number 5550112397

Customer Reviews

Based on 6 reviews
Write your review

These are great

These are a really excellent 12AX7 tube. I expected an overly gainy, pushy, obnoxious Chinese 12ax7, and they are not. I found these to be very much like the Old GE 12AX7 that was ubiquitous for many years If these had the old familiar white printing on them, and the round GE logo , most players would never notice the difference.
Music background: lifelong enthusiast

update on gt-12ax7-M

Update on my first review. i found after listening to my bugerav22 amp the next couple days that my tube was not a mid-gain sounding tube like i thought on first days listen. it falls somewhere between mid & high gain which is fine w/ me. In v1 position is where it sounds low to mid gain to me. it has a nice sweet treble response, moreso than any of my nos & current make tubes.Plenty of treble too, not shrill at all. Still has that spongy feel to it which makes playing fun, that's one reason i rated it so highly. The touch sensitivity does not change when i try different tubes in v3-Phase invertor position either. Lotsa fun trying different tubes in Bugera v22 amp which i got from sweetwater in Feb. 2013. No probs w/ it either, took about 6hrs, 2 seperate gigs for speaker to loosen up. Key is master volume all the way up &overdrive volume on 4 to 5. Those settings kept up w/ a loud drummer & a guitarist playing thru a Twin reverb. Though I did tilt my amp back. Band members were shocked at sound.
Music background: hobbyist

sweet smooth & transparent

tested in v2 slot of bugerav22. have tried nos & current made 12ax7's in v1 & v2 slots. impressions: warm & touch sensitive. that makes me happy w/ my amp. medium output which makes for better control of gain sweep in bugera. am using a used rca 12ax7 in v1 & makes a good match. warmth of tube covers up clarity of sound but might be ok for taming bright amp. would buy another one cause i think its worth it. quiet & no microphonics. been playing 43 years & have excellent hearing.
Music background: semi-pro musician

Nice Tube Quality Construction

Similar to the new Genalex 12ax7 gold lion. First thing you notice is the shear weight of the tube in your hand. China has stepped their game lately.
Music background: Hobbyist

Replacement for GE7005 -Princeton Reverb II 1983 Fender

The GT12AX sound has a crispy clean sound but do not break up as nice as the factory stock GE7005. the GT 12AT7 in V3 Greatly improved Reverb. The GT tubes are slightly noisy but not noted when amp is cranked. The GT Kit which consists of 2 matched GT 12 AX7 are a couple dollars more and I do not hear any difference. I took the GT 12AX7 in the V1 and replaced it with my old GE7005. MY FENDER AMP ROCKS!
See also: Replacement Tubes, Groove Tubes, Groove Tubes Guitar Amp Tubes