I have discovered that by an large only vintage receivers have dedicated Preamp Out. Integrateds do not. I use receivers as preamp only or on occasion as second amp driving just the bass on bi-wired speakers.
I can get modern pre amp but they are ugly and often don't have tone controls.
I am buying vintage for 50% looks and 50% performance. Never underestimate pretty lights and their placebo effect.
P.S. Modern gear is so ugly and overpriced it is untouchable imho.
Same goes for speakers. I hate modern narrow baffle design and tinny sound. Exception being ATC & Tannoy.