Preamp Tube. These 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.
Durable phase splitter or driver tube. Excellent in vibrato or reverb circuits where consistent, high output power is desired.