The control unit of Sansui's 1975 separate system - the partner of the BA-3000 and one of the best-built preamps of the decade.
Sold-price reading for this model →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 JPY 102,000, good JPY 143,400, excellent JPY 180,000 JPY · 7 sold listings · as of 2026-10-18. 7 completed sales in JPY observed on 2026-10-18. fair/good/excellent = min/median/max of the observed SOLD prices (102000 / 143400 / 180000), NOT condition grades - neither source publishes a per-condition split. Sale/completion dates span 2026-04-26 to 2026-10-12. Channels counted: yahoo_closed x4, mercari_sold x3. Sales seen in other currencies are listed but NOT mixed in and NOT converted: USD x1 (2523.98). No exchange-rate conversion was applied anywhere in this file.
Evidence: Audio Heritage (JP) — period catalogue sheets · HiFi Shark — live listings aggregator