The rack-mount power unit of the late-1970s 'Definition' series, 110 W/ch with DC coupling.
Mains-powered vintage Sansui: the AU-X1 and BA-5000 run high rail voltages and are unstable if the original capacitors have dried out. The 'Blackface' and 'Definition' faceplates are easily scratched; the wood cabinets are usually missing.
Marks that can be entered for this maker: Serial number, Model / catalogue number, British capacitor code (Hunts, Mullard), Japanese capacitor code (Nichicon, Chemi-Con, ELNA), EIA component code, Chassis / platter stamp, Version & era marker.
Nothing predates 1979; components only push the date later.
Sold-listing reading: fair NOK 9,000, good NOK 11,000, excellent NOK 13,000 NOK · 2 sold listings (thin sample — indicative only) · as of 2026-10-17. Asking prices only - these are live listings, not completed sales. 2 listing(s) in NOK observed on 2026-10-17 via the HiFi Shark marketplace aggregator; with fewer than three observations the same min/median/max is recorded as an estimate, not as an asking aggregate, which is a reading of the ask spread, not a condition grading. Listings in other currencies were seen and counted for the spread but are not converted here (see the journal): EUR x2, JPY x1, SEK x2.
Evidence: Audio Heritage (JP) — period catalogue sheets · HiFi Shark — live listings aggregator