Posting pics of my four vintage receivers.
Yamaha CR-220 - just used for headphone duty now, with XLR cable hooked up to speaker outputs:
Harman Kardon 730 - powering Infinity P363 speakers:
Sansui QR-6500 - powering Paradigm 11SE Mk II's:
Finally, Sansui Eight Deluxe - powering IMF TLS 50 Mk II's:
The three receivers connected to full size speakers also are sometimes used for headphone duty from the headphone jacks.