The preamplifier half of the classic Dynaco kit system: thousands of PAS preamps were built, and the revision letters (PAS-2, PAS-3, PAS-3X) are the practical way to place one in time.
Valve receiver/unit: HT rails stay live after switch-off and the original can electrolytics must be reformed or replaced before power-up. Output transformers and the faceplate are the value drivers; history of a professional restoration usually adds more than it costs.
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, Version & era marker.
Nothing predates 1961; components only push the date later.
Sold-listing reading: fair $201, good $201, excellent $201 USD · 1 sold listings (thin sample — indicative only) · as of 2012-06 – 2012-06. Only 1 sold listing found in the reachable eBay SOLD table (https://classicreceivers.com/vintage-receiver-values) - below the 3-observation threshold, so this is an anchor, not a market average.
Evidence: Wikipedia · Curcio Audio — Dynaco documentation · +1 more