Features Highlights

Two E88CC vacuum tubes are used in the preamp stage to achieve the warm, mellow sound you can only get from tubes
A pair of Toshiba bipolar power transistors provide strong, driving power and high-quality sound
Sifam VU meters provide precise metering with a classic feel that matches the warm, analog tone from the tubes
Custom-made R-Core transformer counters spikes and instability in the power line, providing consistent, high-resolution amplifier performance with distinctive hybrid sonic characteristics
Lundahl transformers, Nichicon electrolytic capacitors and WIMA polyester capacitors are used to provide the best sound quality possible
Eight headphone jacks with choice of four different output impedances (0.1, 33, 82 and 120 ohms x 2) give you control of the sonic presentation without the extra noise that might be introduced by an impedance selector switch
Two analog (unbalanced RCA and balanced XLR) and two digital (USB and SPDIF digital coaxial) inputs allow the amplifier to be used with a wide range of equipment
Includes power cable

Reviews on HA 5050

What Hi-Fi => http://www.whathifi.com/audio-technica/ha5050h/review
Head-fi.org => http://www.head-fi.org/t/749555/sneak-peek-of-audio-technica-at-ha5050h-pre-production-unit

Audio Technica AT-HA5050H Hybrid Headphone Amplifier