flemingoh 0 Report post Posted July 29, 2006 (edited) Xiangsheng 708B tube headphone amplifier (cum pre-amp). Modified with Alps pot. Only a few months old, with box and manual. SOLD to nice chap. Input impedance: 100K ohm Pre amp output impedance: 50K ohm Headphone output impedance: 32-600 ohm S/N ratio: 89dB Frequency response: 20-30K Hz Distortion: <=0.01% Headphone output power: 500mW-250mW Component used: WIMA MKP Capacitor. Metal film transistor. High efficiency low leakage R-type transformer. Teflon silver placted internal signal cable. Larger casing better heat dissipation then the 708A. Tube: 6N3 x 1, 6N11 x 2, 6Z4 x 1, 6N1 x 1 Tube rectified power supply, no negative feedback circuitry. Edited August 4, 2006 by flemingoh Share this post Link to post Share on other sites