Groove Tubes GT12AT7 Preamp Tube

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Most pros choose Groove Tube! The Groove Tube Process dramatically improves sustain, harmonic balance and tube life span.

This tube is used widely in most of the 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 GT-12AT7 is selected for durability. The GT-12AT7 is tested under extreme listening conditions and guaranteed to be free of excess noise and microphonic ring.