Maintenance has been completed, including replacement of deteriorated parts such as 50 capacitors and 4 transistors! The speaker terminals have been changed to banana plug compatible products. It is a mono amplifier with excellent characteristics of Class A amplifiers, with uninterrupted bass coming out as if it were groaning forward and forward. It has a thick, thick sound that is rare for Yamaha, and it drives a variety of speakers both domestically and internationally. There are dullness, slight scratches, etc., but it is a beautiful individual for its age. Serial 1168, 01817 (Fujisawa Yukishi)
Maintenance information: 2025.7.14 Maintained (4 transistors, 50 capacitors, relays, and speaker terminals replaced. Solder correction. Increase and tighten the output elements. Bias and DC balance checks. I checked the output sound. *This model has a BTL configuration. (There is also an audio output on the negative side of the speaker terminal.)
Accessories: copy of instruction manual
Main specifications: pure A grade 100W mono W271 x H230 x D488 mm 18.4 kg/unit