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Groove Tube 12AX7R
New tube from Russia. Slightly lower gain, quicker compression than GT 12AX7. Great for most Fenders, may not be well suited for high gain Fender type amps (such as Boogie). Item # GT12AX7R. |
List $24.00
Pulse Music price $16.99 each
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Groove Tube 12AX7R2
This 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. Item # GT12AX7R2. |
List $28.95
Pulse Music price $18.99 each
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Groove Tube 12AT7
This tube is widely used in many US-made amps and, in particular, the Fender amps. Fender amps with reverb use two 12AT7s - one for the reverb
drive stage, and one used as a phase inverter to drive the push/pull output stage. The 12AT7s make-up is very similar to the 12AX7 and can
be substituted for a 12AX7 in a pinch, although it won't sound very good. Some players do prefer to use the 12AT7 in the driver stage in
a Marshall for a cleaner, brighter tone. (The driver or phase inverter is the 12AX7 located nearest the power tubes.) The 12AT7 is
rarely used in a tone-generating stage, but rather in function stages, so the GT12AT7 is selected for durability. This tube will some
times bear the number 6201 as well as 12AT7. The GT12AT7 is tested under extreme listening conditions and guaranteed to be free of excess noise and microphonic ring. Item # GT12AT7. |
Pulse Music price $14.99 each
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GT-ECC83
Classic Euro type with medium to high gain and a linear frequency response. Very clear even tone with good bass character. This is the standard tube that was used in Marshall amplifiers and
Vox amplifiers. For those that change first stage gain preamp tubes to change the taste and character of their amps (remember, this can
be done in less than a minute without tools, adjustments, or a "tech"). This is one tube that should be in your basic toolbox. The basic tube sets generally are the 12AX7C, ECC83, and 7025 to cover a
wide range of styles and tastes for most amplifiers. |
Pulse Music price $18.99 each
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