This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
There are many lines of equipment that are carefully hand
crafted in the USA. Unfortunately, these systems are usually
the high-end ones. Some US companies also make gear in the
far east. When in doubt, ask. Some US audio manufacturers are:
Adcom (some made in Japan) http://www.adcom.com
Audio by Van Alstine
Audio Research http://www.audioresearch.com
B & K http://www.bkcomp.com
California Audio Labs (CAL) http://www.calaudio.com/
Carver (some made in Japan)
Jeff Rowland http://www.jeffrowland.com
Krell http://www.pcnet.com/~krell
Mark Levinson http://www.madrigal.com/MLHP5.htm
McCormack
McIntosh http://www.mcintoshlabs.com
Proceed http://http://www.madrigal.com/PROHP2.htm
PS Audio http://www.psaudio.com
Spectral http://www.spectralinc.com
Sumo (Power amps, preamps, CD transports, D/As)
Wadia http://www.wadia.com/index.html
 
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