Unison Research S6 Class-A Tube Intgrated Amplifier
The S6 integrated uses three EL34 power tubes per channel. Operating in class-A, single-ended mode, the output stage produces a robust 35Wpc. Unison engineers have applied 14dB of negative feedback to produce what they feel is optimal sound. The preamplifier stage uses one 12AU7 per channel. Four single-ended, line-level inputs are available, and a tape loop is accessible via a toggle switch on the front panel.