My linestage and amplifier are custom made by a one-person operation in Italy, but he uses primarily vintage parts made in the USA (including Western Electric caps and transformers). My streamer/DAC is made in England, my headphone and phono cartridges are Japanese-made, the headphone amp/energizer is US made, the turntable/tonearm/vacuum clamp/motor controller are US-made, my phono stage is Italian as are most of my speaker (the midrange horn/compression drivers are US Western Electric parts). My power conditions are made by an English company (don't know where they are built), and I have no idea about the manufacturing source of my cabling. All of my tubes are vintage US and German tubes.
Made in USA
I love to support USA products as much as I can. Even if it costs more. Id say 2nd choice Europe or Japan. Last place China.
So USA made HiFi products I have are... Magnepan, Odyssey, Geshelli, Rythmik, Schitt, Bluejean, Belden, Analog Productions( vinyl). Musichall & Monitor Audio (UK), Nagaoka, Magomi(Japan),
Other USA made HiFi I know of.. Kilpsch (high end speakers), Jeff Rowland, P.S. Audio, Emotiva?
Im sure there are more. Please continue list and lets support our own.