Exemplar Extant tube DAC in excellent condition. Very musical analog tube output stage. Uses shunt regulation which is aimed at tightly controlling the operation of tubes. Shunt regulation is a form of parallel tube voltage regulation and an alternative to the common series regulation. It is far more costly in general because it doubles the current requirements of the power supply. Shunt regulation controls current and voltage behavior of tubes, allowing them to perform optimally over their entire life. Includes Stillpoints curcuit board damping technology. RCA coax input. Single ended and balanced output. Price includes shipping and PayPal fee. No trades and serious buyers only. If you have any questions call me at 206-878-3833. If you post a question on Audiogon, I will not respond unless you include your email, so I can contact you directly. Thanks for your interest.