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About Groove Tubes®
For over 30 years, Groove Tubes have been trusted and demanded by touring professionals and their techs
around the world. Groove Tubes started in southern California, and through innovative design, rigorous selection
and testing, GT-powered amps have rocked the world in some of the most famous rigs ever played from studioto stage. Combining our passion for music with the science of sound, the Groove Tubes team still employs thesame testing, grading and matching disciplines that continue to deliver flawless performance every time.

How We Get That Groove Tubes Sound
Guitarists both yesterday and today can be linked by one piece of equipment: The tube amp. With all the
strides in transistor amp technology, guitarists still prefer tube amps. Why do tube amp designs sound and feeldifferently from solid-state? Simply, tubes work differently.
What is a Tube? A tube is an electronic device consisting of a minimum of four active elements: a heater (filament), a cathode, a grid and a plate. All sealed in a vacuum glass enclosure to prevent parts from burning. Onceheated, the cathode begins to emit electrons, which flow from the cathode (which is negatively charged) toward
the plate (which is positively charged). The grid’s purpose is to control this flow, in effect, acting as a valve.
How do Tubes Work? When the guitar’s pickup produces a small voltage (the result of the string vibrating in
the pickup’s magnetic field), this signal is applied to the grid, which causes a large current flow from the cathodeto the plate.
Because of this, a correspondingly large voltage now appears at the plate. A portion of the amp’s electronic
circuitry, the grid bias control, adjusts the proper voltage setting of the grid. When the grid bias is properly set,
the tube is balanced to the circuit, and therefore produces a clean, powerful signal. The plate is connected to an
output transformer, which matches the impedance to that of the speaker.
How do Tubes Distort? As the signal emitting from the plate approaches its maximum potential, the tube
gradually begins to react less and less to the original input signal. This results in a type of compression of thesignal, and the signal becomes cut off or “clipped.” Tube distortion (“clipping”) occurs gradually, producing low
order distortion which compliments the original signal, creating a warm sound. This is also why it’s easy to move
between clean and distorted tones.

The Groove Tubes Warranty
Preamp tubes
Warranted to be free of burn out, excessive noise or microphonics for 180 day from date of purchase.
Power tubes
Warranted to be free of burn out for 90 days from date of purchase. If one tube fails, the whole set will be
replaced to insure proper matching.

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STOCK
GROOVE TUBES
Orange highlighted entries are GT exclusive models
These tubes are generally in stock and are available for immediate shipment. They meet all specifications for
Groove Tubes performance, will enhance the performance of most tube amplifiers available today and will
also bring out the best performance in vintage tube amps. These are the most commonly used tubes; please
see the last page of the pricelist for information on special-order tubes and other available items.

Preamp Tubes
These pass every Groove Tubes premium certification for microphonics, hum, physical characteristics andfunction. Quite simply the best 9-pin triode preamp tubes you can buy — specifically designed and tested
for musical instrument amplification and standard equipment on Fender® amps. Outstanding and consistent
performance for mixing and matching to get a signature tone from your amp.
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-12AX7-C

Great chiming tone with sweet, warm midrange excellent for Marshall® and Fender® amps. Smooth distortion
characteristics and one of the highest-output preamp
tubes in the GT 12AX7 line, with very consistent quality.

555-0112-398$24.99GT-12AX7-M

EXCLUSIVE GT model. An exact reproduction of theacclaimed Mullard ECC83 design, which was the tube
found in most high-quality musical instrument andhi-fi amplifiers of the ‘50s, ‘60s and ‘70s. This tube
has a complex mica design using four insulators thatshock-mount the cathode to enhance stability andsound quality. Excellent all-around sonic character that
adds vintage clarity and feel to any modern amp — aslightly rounder, deeper and all-around warmer tone
with clarity. A lower-gain 12AX7 tube, it is a highly
musical, harmonically rich and an excellent performer.

555-0112-397$24.99GT-12AX7-R

The most widely used design in new amplifiers today.
Extremely rugged, consistent and forgiving, it’s agreat all-around replacement given its inherently
darker tone and relatively low gain. Can be slightly
harsh when overdriven, but its warmth makes it agood choice for higher-gain and brighter amps andfor keeping unwanted feedback and over-the-top
overdrive under control.

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Preamp Tubes
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-12AX7-R2

Longer-plate-structure version of the standard “R”
series tube, which produces brighter tone. Larger
plate makes this tube slightly more prone to microphonic issues when used with high-gain amps. Suggested for use in darker amps to brighten tone. Verylive and responsive, with good clarity.

555-0112-396$24.99GT-12AX7-R3

The highest-gain output tube in the “R” series, thistube is similar to the R2 and has similar output, butwith a shorter plate, higher gain, and a more consistent quality variance score. An extremely consistenttube useful in most applications.

555-0113-209$24.99GT-12AT7 (ECC81)

Durable phase splitter or driver tube. Excellent in vibrato or reverb circuits where consistent, high output
power is desired.

555-0112-400$24.99GT-12AU7

Our lowest-gain preamp tube. Can sub for a 12AX7
to lower gain and produce a very creamy, warm tone.
Great for harp or blues when softer, more compressed distortion at lower volumes is desired. Very
low gain and very mellow output.

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Preamp Tubes
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-12AY7

Low-gain tube used in very early Fender amps. Can
sub for a 12AX7 to lower gain and produce a slightly
warmer tone. Great for harp or blues where softer,
more compressed distortion at lower volumes isdesired. Medium/soft gain.

555-0112-395$24.99GT-ECC83-S

Our highest-gain preamp tube, this tube has a hugeamount of gain, with terrific output that makes it agreat choice for driving modern, complex high-gain
circuits. It has a relatively high quality variance(making Groove Tubes pre-testing procedures
especially important in this case), with a tight, strong
and relatively bright tone that can really liven up a
weak or tired old vintage amp or a new amp withgrade-quality tubes.

555-0112-391$24.99GT-5751-M

EXCLUSIVE GT model. This is very similar to the
12AX7M, but with lower gain and output. Probably
the most forgiving tube in the preamp series, it’s an
excellent replacement for stock tubes that sound too
harsh. It’s also a great upgrade for any high-gain amp,
for improved definition and stability (less squealing).
Especially recommended for Hot Rod Deluxe™
and similar Fender® and Marshall® high-gain
modern amplifiers.

555-0112-394$24.99®

Rectifier/Specialty
These pass every Groove Tubes premium certification for microphonics, hum, noise floor, physical operation and characteristics. Includes rectifier tubes, phase inverters and specialty kits specifically designed andtested for musical instrument amplification applications as noted.
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-5AR4-R

Our highest-output rectifier tube. Originally used inearly higher-powered Fender® amps (40 watts or more)with tube rectifiers; also used in the Vox® AC30.

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Rectifier/Specialty
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-5U4

Medium-output rectifier tube originally used in earlymedium-power Fender® amps with tube rectifiers.

555-0112-401$34.99GT-5Y3Low-output rectifier tube originally used in early lowpower Fender® amps with tube rectifiers (Champ®,
Princeton® and Deluxe). May also substitute for a
5AR4 or 5U4 for lower output levels.

555-0114-302$34.99

GT-6CA4The lowest-output rectifier tube in the GT line;
commonly used during the ’60s in student andpractice amplifiers.

555-0112-402$34.99Special Applications Group – High Performance Exclusive GT Testing, Matching, Grading
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

SAG-AT7-MPI

Selected and matched for critical audio and guitar/bass amplifier use, where a match of the two sides of
the triode are desired for phase inverter or driver use.

555-0114-091$29.99PRICES EFFECTIVE JULY 1, 2012
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Special Applications Group – High Performance Exclusive GT Testing, Matching, Grading
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

SAG-AX7-MPI

Selected and matched for critical audio and guitar/bass amplifier use, where a match of the two sides of
the triode are desired for phase inverter or driver use.

555-0114-092$29.99Fender® Hi Gain Kit
SAG-FHG

Two selected high-gain ECC83 tubes optimized
for the preamp stage of Fender® amplifiers thatuse a dual triode in the first gain stage. Includes
two preamp tubes and one GT12AT7 - MPI matchedphase inverter.

555-0114-099$99.99Fender® Soft Touch Kit
SAG-FST

Two selected lower-gain, slow rise time 12AX7 tubes
optimized for the preamp stage of Fender® amplifiers
that use a dual triode in the first gain stage. Includes
two preamp tubes and one GT12AT7 - MPI matchedphase inverter.

555-0114-100$99.99Marshall® Hi Gain Kit
SAG-MHG

Two selected high gain ECC83 tubes optimized forthe preamp stage of Marshall® amplifiers which use
a dual triode in the first gain stage. Includes two
preamp tubes and one GT12AX7 - MPI matchedphase inverter.

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Power Tubes
These pass every Groove Tubes premium certification for microphonics, hum, noise floor, physical operationand performance characteristics. We also analyze and match the gain-to-distortion ratio on a dynamic basis,
assuring a powerful, singing tone that is rich in harmonics and balanced for longer sustain, wider frequency
response and a more musical amplification experience. Quite simply the best 8-pin pentode tubes you can
buy that are specifically designed and tested for musical instrument amplification. Sold as single tubes,
matched duets, quartets and sextets. Standard equipment on Fender® tube amps.
Our power tubes are matched and rated in low, medium and high output levels. Most amp manufacturers
bias their amps for tubes in the “medium” range, and replacement of stock tubes frequently do not requirere-biasing if “mediums” are purchased. For softer feel, quicker distortion and creamier tone, we suggest“lows”; for more dynamic headroom and tighter, quicker and harder overall response, we suggest “highs”.
Lows and highs are more likely to require re-biasing by a qualified service technician to meet yourperformance preferences.

6V6
The 6V6 is a low-output power tube (12-18 watts) often used in Fender® amplifiers, including the Champ®,
Deluxe™, Dual Professional, Vibro-King®, Princeton®, Vibrolux® and others. It has a very warm, round and soft
response with rich harmonics, and distorts easily. One of the best choices ever produced for rehearsal andrecording amplifiers. Available as singles, pairs and quartets; stocked in “medium” power ratings. Also
available by special order with “low” and “high” power ratings (please contact customer service for these).
PRODUCTDESCRIPTION

GT-6V6-C

Classic design and the most affordable choice in the GT
6V6 line. Warm overdrive and soft distortion character.

GT-6V6-R

GT-6V6-S

STOCK NUMBER

MSRPSingle 6V6 tube in “medium” power range.

555-0113-678$24.99Matched pair of 6V6 tubes in “Medium” power range

555-0113-527$49.99Matched quartet of 6V6 tubes in “medium” power range.

555-0113-530$99.99Single 6V6 tube in “medium” power range.

555-0113-686$29.99Matched pair of 6V6 tubes in “Medium” power range

555-0113-533$59.99Matched quartet of 6V6 tubes in “medium” power range.

555-0113-536$119.99

Single 6V6 tube in “medium” power range.

555-0113-691$34.99Matched pair of 6V6 tubes in “Medium” power range

555-0113-539$69.99Matched quartet of 6V6 tubes in “medium” power range.

555-0113-542$139.99

Solid, predictable performance, the most usedwidely used tube design in stock amplifiers frommajor manufacturers in the 6V6 line.

Our most premium design, for long life and professional
performance. The choice for many pro players who use
Groove Tubes in their favorite amps for recording andrehearsal; fully captures the spirit and sound of tube
amps from the ’50s and ‘60s to the present.

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Power Tubes
6L6
A medium-output power tube (generally 20-25 watts) often used in Fender® professional amplifiers including
the Bassman®, Bandmaster®, Concert, Dual Showman®, Hot Rod Series, Pro Series, Super Reverb®, Tremolux™,
Twin, Vibrolux®, Super-Sonic™, Blues Deluxe™, Blues DeVille™ and others. Available in many variations, its
response is round, with a pronounced midrange character; strident and chesty with a super-bright and clean,
powerful punch. Perhaps the most recognized signature tone for U.S. guitar music of all styles from the ’60s
onward. Stocked in “medium” power ratings; also available as special orders with “low” and “high” power
ratings (please contact customer service for these). Available as singles, duets, quartets and sextets.
PRODUCTDESCRIPTION

GT-6L6-CHP

EXCLUSIVE GT design. This black-plate (carbonizednickel) design features extended heatsink wings. Has
strong and focused output, and is highly recommended
for enlivening any stock Fender® or Marshall® that uses
a standard 6L6. High-performance design delivers
30 watts, with very high performance/headroom. An
outstanding replacement for any tube amp with 6L6
power tubes.

GT-6L6-R

GT-6L6-GE

STOCK NUMBER

MSRPSingle 6L6 tube in “medium” power range.

555-0113-677$34.99Matched pair of 6L6 tubes in “Medium” power range

555-0113-497$69.99Matched quartet of 6L6 tubes in “medium” power range.

555-0113-500$139.99

Matched sextet of 6L6 tubes in “medium” power range.

555-0113-625$209.99

Single 6L6 tube in “medium” power range.

555-0113-683$34.99Matched pair of 6L6 tubes in “medium” power range.

555-0113-515$69.99Matched quartet of 6L6 tubes in “medium” power range.

555-0113-518$139.99

Matched sextet of 6L6 tubes in “medium” power range.

555-0113-626$209.99

Single 6L6 tube in “medium” power range.

555-0113-682$39.99Matched pair of 6L6 tubes in “Medium” power range

555-0113-503$79.99Matched quartet of 6L6 tubes in “medium” power range.

555-0113-506$159.99

Matched sextet of 6L6 tubes in “medium” power range.

555-0113-539$239.99

Solid and consistent performance; very sturdy andreliable. AKA 5881.

EXCLUSIVE GT design. The GE is a faithful reproductionof the original “clear top” 6L6. The flagship of the GT
6L6 line, it looks and sounds exactly like the original
G.E. tube used by Fender® in the ‘50s and ‘60s. It took
more than four years to develop, and has stunningclarity and power. Our most recommended 6L6.

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Power Tubes
6L6 Cont.
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-6L6-S

Great dynamics and a very sweet, punchy tone withenhanced power rating and performance. Morebrilliant top end and a very full, pronounced andround low-frequency output. A solid replacement for
stock performance.
Single 6L6 tube in “medium” power range.

555-0113-685$39.99Matched pair of 6L6 tubes in “medium” power range.

555-0113-521$79.99Matched quartet of 6L6 tubes in “medium” power range.

555-0113-524$159.99

Matched sextet of 6L6 tubes in “medium” power range.

555-0113-703$239.99

EL34
The original power platform behind most high-powered British guitar stacks from the ’60s onward. Output
is generally between 20 and 25 watts, with pronounced midrange punch, tight low end and crisp top end
that breaks up relatively smoothly and gets a little crunchy when pushed hard. It provides a great voice thatstands out in a band mix as the mids tend to power their way through an overall mix. Big brother to the EL84.
PRODUCTDESCRIPTION

GT-EL34M

The GT EL34 is based on the original Mullard® EL34
of the ‘60s — the stock tube in all early Marshall® and
Hiwatt® amps. Mullard produced it for about 15 years,
and this is a faithful reproduction of the classic XF2dual-getter version. It has a big, fat and well-defined
tone and really “wakes up” reissue amps to perform
like the originals. As close as you can get to vintage
Marshall® power tube heaven.

GT-E34L

STOCK NUMBER

MSRPSingle EL34 tube in “medium” power range.

555-0113-694$34.99Matched pair of EL34 tubes in “medium” power range.

555-0113-557$69.99Matched quartet of EL34 tubes in “medium” power range.

555-0113-561$139.99

Single E34L tube in “medium” power range.

555-0113-687$39.99Matched pair of E34L tubes in “medium” power range.

555-0113-545$79.99Matched quartet of E34L tubes in “medium” power range.

555-0113-548$139.99

EXCLUSIVE GT design. The heat wings attached to theplate give our version of the original EL34 15-20 percent
more power. Interchanges in any EL34 applicationand stays tight and robust all the way up to full power.
Highly dynamic, big low end and runs cooler for longer
life. Amazing headroom, killer tone and all of the greatfeatures and characteristics of the EL34 design.

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Power Tubes
EL34 Cont.
PRODUCTDESCRIPTIONSTOCK NUMBER

MSRP

GT-EL34R

A more modern implementation of the original at anaffordable price, and currently standard issue on many
U.K. amps. Very durable and consistent, which is goodfor manufacturing, but the distortion can be slightly
harsh, and it lacks a little high end. This makes it more
forgiving, but can sound a little dull.
Single EL34 tube in “medium” power range.

555-0113-695$34.99Matched pair of EL34 tubes in “medium” power range.

555-0113-569$69.99Matched quartet of EL34 tubes in “medium” power range.

555-0113-572$139.99

EL84
Exhibits many of the same characteristics as the EL34, but with a power output of roughly 5-8 watts. Very
creamy and smooth; used in many modern class “A” amps. Nearly every modern tube amp company producesa small amp, and Groove Tubes EL84s are a perfect upgrade for any stock tube in these amps. Great for recording
and rehearsal; with a soft and tactile touch, rich harmonic response and pleasingly musical top end.
PRODUCTDESCRIPTION

GT-EL84-S

The warmest Groove Tube in this family. It remains very
buttery, with relatively high power output and very
even response. A great replacement for many modern
stock amps, overcoming a variety of design issues andlimitations in inexpensive tube amps. A great way to
upgrade your amp and step up to Groove Tubes tone
with one of our best sellers.

GT-EL84-R

STOCK NUMBER

MSRPSingle EL84 tube in “medium” power range.

555-0113-698$29.99Matched pair of EL84 tubes in “medium” power range.

555-0113-580$59.99Matched quartet of EL84 tubes in “medium” power range.

555-0113-583$119.99

Single EL84 tube in “medium” power range.

555-0113-697$29.99Matched pair of EL84 tubes in “medium” power range.

555-0113-574$59.99Matched quartet of EL84 tubes in “medium” power range.

555-0113-577$119.99

A solid performer — good quality and long lasting.
Tends to be a little more aggressive and edgy whenpushed into overdrive. This version is a little brighter,but still has a nice smooth top end. Unique characterwith moderate output.

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Power Tubes
6550/KT88
One of the highest-output 8-pin pentodes available. Originally manufactured in the United States by G.E.®, itdelivers 35 to 50 watts per tube and was original equipment in Ampeg SVT and Marshall® amps during the ’70s
and early ’80s. A big, clean, tight tube with amazing headroom and performance and great power and dynamics. A similar tubes is the KT88 (used by Sunn® and others). The highest-output power tube in this family.
PRODUCTDESCRIPTION

GT-6550R

Our highest-output 6550 is slightly easier to push
into distortion than the original G.E.® version and has
a harder response than the “C” for tighter, quicker
response. Good for bass amps and metal, when more
pronounced note definition is desired with just a touchof distortion.

GT-6550C

GT-KT88SV

STOCK NUMBER

MSRPSingle 6550 tube in “medium” power range.

555-0113-690$69.99Matched pair of 6550 tubes in “medium” power range.

555-0113-477$139.99

Matched quartet of 6550 tubes in “medium” power range.

555-0113-480$279.99

Matched sextet of 6550 tubes in “medium” power range.

555-0113-624$419.99

Single 6550 tube in “medium” power range.

555-0113-676$69.99Matched pair of 6550 tubes in “medium” power range.

555-0113-488$139.99

Matched quartet of 6550 tubes in “medium” power range.

555-0113-474$279.99

Matched sextet of 6550 tubes in “medium” power range.

555-0113-719$419.99

Single KT88 tube in “medium” power range.

555-0113-689$99.99Matched pair of KT88 tubes in “medium” power range.

555-0113-602$139.99

Matched quartet of KT88 tubes in “medium” power range.

555-0113-620$279.99

Matched sextet of KT88 tubes in “medium” power range.

555-0113-628$419.99

Our softest 6550 is easier to push into distortion thanthe “R” version or the original. Has a nice character
that breaks up slightly earlier, which some players preferin a Marshall®. A 6550 standard, this tube will produce
a stock signature distortion at lower levels than the“R” version.

EXCLUSIVE GT design. This is the highest-output
power tube in the 6550/KT88 family, with special heatdissipation wings on the plate that let it reach thesame power specs as the original Gold Lion KT88 of
the ’60s. The best, most durable and most powerfultone in the family, with outstanding dynamic response
and big bottom end. The definitive tube for bass
amps, country, jazz, metal and any situation in whichmost of the tone shaping occurs in the preamp, pedals or
effects. Amazing high-horsepower delivery of clean tone.

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SPECIAL ORDER TUBES
Matched Power Tube Sets
Our stock matched-power tubes sets are offered in the “medium” range. We use a 10-point scale (10 being the highest output ); “medium” tubes fall in the 4-7 range and are most similar to stock tubes for many
amplifiers, especially Fender®.
For amp service techs or those wishing to customize amplifiers to achieve specialized tone, “high” (8-10) and“low” (1-3) tube sets are available. In most cases, these may bequire amp re-biasing by a qualified service
technician. Please contact customer service to purchase matched sets with ratings other than “medium.”

Non-Stock Tubes
There are many other tubes in the Groove Tubes lineup that are non-standard for use in ampifiers today andare not included on this pricelist. These include preamp, rectifier, power amp and microphone tubes such as
the 6205, 6922, 7027, 7591, 5881C, KT66, KT77, etc. Please contact customer service to check availability ofthese tubes and for information on your other special-order needs.

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PRICES EFFECTIVE JULY 1, 2012

SILVER SERIESIn a world of “Good, Better, Best” choices, Silver Series tubes are the “Better” choice.
They are excellent workhorses in many amplifier circuits in reverb driver, phase inverter or other applications,and can also be an excellent choice in the audio chain in most positions. Silver Series tubes are fully functional
and pass many of the same exhaustive tests of premium Groove Tubes. They exceed all basic industry specifications
for performance and provide a very affordable alternative for use in non-critical applications.
Silver Series power tubes are perfect for single power tube (non-matched) use, as spares or use in project amplifiers.
Silver Series preamp tubes are great for “sampling” different preamp tube performance characteristics, toexperiment with your sound.
Please contact customer service for information on current inventory availability, pricing and special opportunities
to purchase Silver Series tubes.
PRODUCTSTOCK NUMBER

Silver Series preamp tubes - various

Call for Avail.

Silver Series rectifier tubes - various

Call for Avail.

Silver Series power tubes - 6550

Call for Avail.

Silver Series power tubes - KT88, KT66

Call for Avail.

Silver Series power tubes - KT77

Call for Avail.

Silver Series power tubes - EL34R, 6L6S, 6L6R

Call for Avail.

Silver Series power tubes - 6L6CHP, 6L6C, 6L6GE, 6L6R, 6V6S, E34LS, EL34M

Call for Avail.

Silver Series power tubes - 6V6R, EL34C, EL84R, EL84S

Call for Avail.

Warranty
Warranted to be free of burn out for 30 days from date of purchase.

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Prices and specifications subject to change without notice. Copy, descriptions and applications may not be used without permission. ROKR Ventures, Inc.,
A wholly-owned subsidiary of Fender® Musical Instruments Corporation Scottsdale, Arizona 85250-2610 - USA. All rights reserved.