I don't think I'd hesitate to pick up anything if the price were right. All things being equal, I'd bias towards American made stuff; European made as a second choice, and Japanese made bringing up the rear.
Before axes are sharpened

the issue isn't snobbery, nor jingoism. The 1960s Japanese vacuum tube (point to point wired) receivers are cramped and somewhat messy below decks. That makes them kind of hard to work on (at least for a fat-fingered
schlub like me).
I find some of the European equipment a tad arcane (this applies more to the radios more than hifi equipment).
The Marantz (amps), McIntosh (amps, preamps) Fisher (amps and receivers) and - to a slightly lesser extent - Scott (amps and receivers) are pretty restorer-friendly in layout. The Sherwoods are great, but a little complicated, too. Some harman-kardon amps and receivers are uncommon, inexpensive, and fairly decent candidates for restoration (some employ some less-than-plentiful tube types; some can be 'worked around'). The 'odd tube' caution applies to Stromberg-Carlson equipment, too, in some cases - but S-C is another "almost below the radar" brand with good quality at a reasonable price.
The vintage Radio Shack (mostly Japanese made) can be found inexpensively; some of it's not bad at all to work on/restore.
Most of the Lafayette-branded hifi gear of the 1960s was made in Japan by Kenwood. Allied's "333" receiver is a rebranded Pioneer SX-34.