Groove Tubes GT-5751-M

GT-5751-M description:

Groove Tubes GT-5751M - This is a lower gain 12AX7 tube type. Quiets many amps down and these are a very smooth front end tube but are also quite amazing in the phase inverter position. In the Fender Hot Rod series these are really the rage these days with many of GT's folks that use these amps.