Mid 1980s vintage amp. Reviews here. https://www.hifinews.com/content/harman-kardon-pm650
Has a very good discreet phono stage that handles MM or MC cartridges. In fact I feel the phono stage is best I have heard from an integrated amp. Rated 50w RMS per channel but delivers 75w/ channel due to high current Fully discrete with high quality Elna for Audio capacitors inside. it’s heavy and well built.
I bought this for curiosity as I had one in the 80s. Placed it against my Audia Flight and it’s almost up to the same level, possibly the phono is