GemTune BL-02 Class A Integrated Tube Amplifier with Tube 5Z3PX1,EL34-BX2,6N9PX2 Tube EL34B tube upgraded to PSVANE brand .Particularly Ideal for Vocal Music & Chords Class A Single Ended Amplifier to reduce distortion;stereo Hi-Fi Integrated Amplifier brings you exquisite & refined music Self-Biasing Design; Analog Inputs; Output tags for speaker impedance: 4/6/8ohm.To ptotect the amp,tube and machine are packed individually. Please download the user manual from:https://s3.amazonaws.com/Doctor-001/GemTune+Amp/Manual+for+Tube+Amplifier+BL-02.pdf GUARANTEE We provide a 1 year warranty for the amplifier and 2 month warranty for the tubes. Our goal is to provide 100% customer satisfaction so you can buy with confidence!