Sansui Manufacturing Transistor Integrated Amplifier AU-D55F

This is an integrated amplifier, not a preamplifier, but since there is no integrated amplifier option in Mercari's settings, I have no choice but to list it this way.
I bought this about 10 years ago used, as a spare. My main amplifier is a Sansui vacuum tube integrated amplifier, the AU-111. It is located behind the white and pink flat baffle with Telefunken and Western Electric triodes placed in front as dummies, on the lower left side of the screen. (The sound is ultimate, but I have it set up this way due to dissatisfaction with the front appearance.) When I purchased the AU-D55F, I tested it and there were no issues. I have not used it since then. Compared to the AU-111, my impression of its sound at the time was clear, expansive, and orderly, with a natural, lifelike vocal sound that emerged in front. So why did I stick with the AU-111? When I ask myself, it's because I felt that the AU-111 could reproduce the deep flavor of sound from the era when movie theater sound was vacuum tube monaural. (Incidentally, I also own another AU-111 as a spare.)

After a successful bid, I will check for any abnormalities before shipping, so please feel free to ask if you have any concerns.