YAMAHA MA10 Headphone Amplifier - Working Condition

・Purchased quite some time ago, but it has many input/output terminals and I believe it can be used in various ways.
・The equipment I own is always regularly maintained, and this unit has also been serviced and is in normal working order. (No crackling, sound interruptions, or poor contact.)
・Photos 3/4 show areas of discoloration. (No paint deterioration or stickiness.)
・Originally, the unit uses 6 AA batteries (9V), but in the past, I accidentally left the batteries in, causing the terminals to rust and break off. (There is no leakage inside the unit.)
➡Therefore, I had a musical instrument repair shop replace the battery terminals with a snap for a 009P battery. This allows for normal battery operation.
➡The old battery case will be included.
・AC adapter (center negative 9V) is not included; only the main unit.
・If you search for YAMAHA Headphone Amplifier MA10 on the web, you can download the instruction manual from the manufacturer's website. (Please check it first.)
・As this is an older unit, please understand the 3N policy (No complaints, No returns, No cancellations).