The bigger 1975 flagship: 110 W/ch, twin power supplies and the 'Definition' series styling.
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 1975; components only push the date later.
Sold-listing reading: fair $1,473, good $1,970, excellent $2,799 USD · 4 sold listings (thin sample — indicative only) · as of 2026-10-17. Asking prices only - these are live listings, not completed sales. 4 listing(s) in USD observed on 2026-10-17 via the HiFi Shark marketplace aggregator; min/median/max of the observed asks are used as fair/good/excellent, 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, PLN x2.
Evidence: Audio Heritage (JP) — period catalogue sheets · HiFi Shark — live listings aggregator