A mix ... new power amps (Outlaw M200 monoblocks), refurbed old, tubed preamp (ARC SP-6) and tuner (Fisher 90B), new CD and streaming (Oppos 105), old Thiel speakers (3.5's), old Teac tape gear (4070 and 180), relatively new Marantz CD recorder. In my second system, mostly old .... Carver C2 preamp, Amber 70 power amp, Carver TX-2 tuner, Sony SCD SACD player (2002), and Theil speakers. In my bedroom system I go old and good, but cheap: KLH model 5 speakers (1967,) Onkyo receiver (2000), and a Nakamichi cassette deck.
The key thing is .... there are good sounding "old" and bad sounding "old". There is good condition "old" or bad conditioned "old". There is also a wide range of quality and price of new gear. I use live music and my guide, and then apply a reasonable place on the price-performance curve. In general, I find this leads me to a lot of older gear.