Thanks for the info Bully, it has a very strong power supply for 55 watts with 2 x 10,000 uf caps. It was designed for a turntable, it has a 15hz and 30hz subsonic filter and a selector for MM and MC cartridges. It needed the balance and volume controls cleaned and has been playing fine for the last 3 hours. Oldmarantz, it sounds great, warm sound with a solid low end. It reminds me of my Dads' Luxman M-02,C-02.T-02 system. Thor, I thought the faceplate and case looked like your Luxman Preamp and Amps.
It has jacks on the back for signal processor in and out that can be switch in or out. My guess that these are pre out / main in jacks.