Description features:The PRELUDE ONE is designed for audiophiles listening to music with digital audio players such as iPod. The triode tube and special output transformers fit perfectly with digital audio players to achieve flawless harmony and smooth sound.  No matter if you listen to a classical concert or modern pop music, we guarantee you a new depth of sound experience with the beautiful audio amplifier PRELUDE ONE.  The combination of highest sound quality and modern design is captured in an amazing compact box.  You can adopt all kinds of audio equipment like CD players, MD players, FM tuner and etc. Nothing can compare to the unique and rich spectrum of tone colors produced by tube based audio equipment.Technical specifications :
Single Ended Stereo Integrated Amplifier
Pure Class-A  Operation
2 x 6N1P  Line and Driver stage
1 x 6AS7G dual-power-triode 13 Watts plate-dissipation
Input Sensitivity : 0.7V RMS for Rated Output
Input Impedance : 100K ohm
2 x RCA 24k gold plated Input
Teflon Insulation
Alps Blue Velvet Volume
WIMA MKP Capacitors
24K gold plated Binding Post for Speaker Terminal
Selectable Line Input & Record output
Heavy duty Toroidal Power Transformer
High current air gapped Toroidal Choke Transformer
Multiplayer wide band air gapped Toroidal Output Transformer
Output Power : about  5 Watts / channel
Output Impedance :  ( 4 or 8 ) ohm
Damping : 10
Frequency Response : 10Hz - 20KHz +0 , -0.1dB  @ 1 Watt
Harmonic distortion : 80% of THD @ 100Hz 15kHz
Power Consumption : 80 Watt / AC115V/ 220V/ 230V (50/60Hz)
Dimensions (mm) : W260 x D260 x H170
Shipping Weight : 11Kg
The PRELUDE ONE uses power output triode "6AS7G" and "6N1P" for input stage and driving stage respectively.