Unison Research launches the SH-- a single-ended two-stage headphone amplifier using valve technology to provide “world-class sound from a specialised device using the best technology available."
Designed for use with both digital and analogue sources, the SH features a linear circuit the company says produces low negative feedback and an output voltage able of driving a wide range of headphones. An ECC83 valve takes care of the input stage while output comes from an EL84, a valve capable of driving the output transformer with "optimal electrical and sound character."