This is an Accuphase phono equalizer unit. PHONO input can be added to compatible models by installing it from the rear panel. The printed board uses a Teflon base material and is equipped with a dedicated input circuit that matches each MM/MC cartridge. There are no visible scratches on the exterior, etc., and it is good with just the degree of dullness (Kobayashi Hitoshi)
Maintenance information: 2026.6.13 sound output confirmed
Accessories: instruction manual, wrench
Main specifications: Compatible models C-2800 C-2810 C-290 C-290V C-2400 C-2410