YAQIN MC-10T EL34B*4 Hi-Fi Integrated Push-Pull Tube Amplifier Powered by 4*EL-34B tubes,can be replaced by 6CA7 tube. SRPP preamp circuit product wider frequency response and low distortion Adopt ultralinear push-pull amplifier circuit to produce enough power to push low frequence. Output transformer is made by Japan audio-specific oriented silicon steel sheet(0.35mm) and free-oxygen high-intensity enameled wire,To insure wide frequency response and bright tremble and bass Adopt audio-grade Electrolysis and Philips MKP AC capacitor Make it low-noise,quite music background and durable.