Sansui G-8700DB 160 watt receiver from the late 70s. Not the oldest, but a major favorite. I got it at a thrift store in the early 00s. Absolute unit, probably 25 kilos. The connectors are all on the side because the heat sink takes up the whole rear panel. Every switch, circuit and light bulb works perfectly.

It's hooked up to my computer via a nothing-fancy DAC and out to a pair of tidy Linn bookshelf speakers, probably 80s vintage. If this office over the garage is rockin', don't bother knockin'.

Here's a photo (not my one, but the same) - https://external-preview.redd.it/LjSphe7ctrkecpkmC_r97bMzzgg...