Groove Tubes GT-12AT7 Preamp Tube (ECC81) (Guitar Amp Valve)
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.)
- Single preamp tube for use in guitar amps.
- Often used for phase inverters and reverb units.
Durable driver tube. Excellent in vibrato or reverb circuits. Consistent high output power.