I have 10 electronic devices, possibly all from the 1970's. They all power up and all functions seem to work. On one receiver, a Yamaha AC-HTR-5835 part of the faceplate is missing., a few have a remote but most don't. Here's the list: Receivers: Yamaha's : R-V98, HTR-5840, AC-HTR-5835.
, Sherwood's: RX-4109, RD--6500. JVC-AX44. Marantz-SR-73. Realistic - STA-22, Integra amplifier. Tuner: JVC - FX-333.