I collect single and twin-lens reflex cameras, and now Sony televisions.
With SLR cameras, I put the "vintage" label at c. 1975 - mechanical operation, no electronic shutter mechanisms, but it may have a battery operated or selenium meter. Prior to rapid advance levers, I consider them "antique."
With TLR cameras (the other type I collect), I consider them all to be vintage, because there are no electronic shutters in this design I am aware of, and even the current Rolleiflex model is simply the reproduction of the vintage design. Even the pro-level Mamiya C330 was a Luddite machine, produced until about 1985, and many are still in use with the film guys, myself included.
With Sony televisions (buddy Red Raster got me onto this) - if it has a channel knob and no remote, it's vintage. My 14" Trintron is my absolute favorite TV. I think I'd agree with Jon A - if it has AV inputs, it's not a vintage TV. But, I'd consider my Beta machines to be vintage. Guess it depends on the product itself to a degree.
Whatever the answer, watching old Dr. Who and Star Trek episodes on my Betas hooked up to the 14" Trinitron is as good as it gets.
Just one guy's opinions.