Ruby Tubes/JJ 12AX7ACZ-HG High Gain Pre Amp Tube
 
ECC83S is 12AX7 high gain pre-amplifying double triode. Thanks to its design it also performs with very low noise and microphonics. Harmonically rich, with a detailed low end and a warm high end. This tube provides exceptional clarity and warmth that will bring any amplifier to life. With a balanced midrange, you'll be able to hear every detail of the music with ease.