Let's distinguish between 'vintage' and old junk. Let's use 1990 as an arbitrary curt-off date. This is by no means exhaustive, but this is some equipment I consider vintage, collectable, and worth restoring.
Any American-made tube gear - Vintage High-end.
Any separate components - Vintage
Any Marantz receiver with a black glass, turquoise light tuner and 'Gyro-Touch tuning' - Vintage.
Pioneer, Kenwood, Sansui, receivers - Old Junk
Any Thorens, B&O, Dual or Higher-end Technics, Denon or JVC DD turntable - Vintage.
Pioneer. Kenwood (Except KD-500) BIC Turntable - Old Junk
Any Tandberg, Revox, TEAC, or Sony Reel-to-reel - Vintage
Akai or Dokorder - Old Junk
There are way too many speakers to list, but certainly Large Advents, Dahlquist DQ-10, ADS, especially the 810, JBL (the bigger the better), Altec (15" woofer + horn), Klipsch, Quad, any LS3/5a, Harbeth, Spendor, are vintage loudspeakers.
Feel free to add or be insulted. :-)