Description Groove Tubes GT-12AT7 These tubes pass every Groove Tubes premium certification for microphonics, hum, physical characteristics and function. 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. Excellent 12AT7 choice for instrument amplification ECC81 equivalen
