This is a fun and great DAC. You can upgrade and play around with this to your heart's content. I upgraded the op amps to Sparko's for a total value of $200 and it made a significant difference Please see links below. Also great for tuberolling. I currently run a Amperex branded E88CC/6922 which I feel gave a smoother vibe than the stock EH 6922. I have the original box and will ship CONUS via USPS
https://www.dagogo.com/eastern-electric-minimax-tube-dac-supreme-discrete-opamps-survey/ https://audiokarma.org/forums/index.php?threads/new-op-amps-for-a-music-hall-dac-25-3.812527/ USB input accepts 24bit/96kHz signal, electro-harmonix 6922 tube single-ended (rca) output, solid-state differential balanced output ti PCM 1796 24bit/192kHz DAC, ti SRC 4192 asynchronous sample rate converter, high precision active crystal oscillator master clock User selectable 96kHz or 192kHz upsampling, asynchronous reclocking and anti jitter control system, 8 x oversampling digital filter 4 digital inputs: coax (s/pdif), optical, XLR (AES/EBU), or USB, 2 gold plated outputs; single ended (RCA), balanced (XLR), headphone output with adjustable analog volume control Large high current oversize r-core power transformer, thick brushed aluminum fascia and solid chassis, 110v/220v voltage selectable transformer, detachable power cord
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