※It has been replaced with a rubber edge. A masterpiece of full range units. The overhang of the sound from mid-bass to mid-range is excellent, and the vocals resonate sensually with a life-size sound image. There is stickiness on the inside of the frame. Serial 125664/125654 (Oikawa Tetsuji)
Maintenance information: 2024.3.18 Operation confirmed
Accessories: none
Main specifications: 20cm full range Alnico magnet 8Ω 89dB input 40W depth 98mm approx. 3.5 kg/bottle
Fully maintained in 2023. The original MC275 is the pinnacle of Macintosh tube amplifiers. A famous historical machine that intensely entertains music with its velvety luster and strong tone. Instead of resolution or wide range, the rich sound that makes you feel a sense of life is truly the Macintosh sound itself. On the exterior, characters have disappeared, and there is oxidation etc. depending on the age (Murakoshi Yoichi)
Maintenance information: 2023.6.4 Maintained (thermistor deterioration replacement and 2 additional ones. Replace 3 100 μF electrolytic capacitors and others for deterioration ·. Replace 4 100/30 μF deterioration block capacitors. Replace 2 oil capacitors with 0.22 μF deterioration. Lug terminal deterioration replacement. Vacuum tube 12BH7 replacement. Vacuum tube socket and RCA jack caulk repair and other operation checks completed (measured at 72 to 105 W SP: 8 Ω with rated output AC 100 to 117 V)
Accessories: none
Main specifications: 75W+75W (in stereo) 150W (in mono) vacuum tube 12BH7 x 2, 12AX7 x 1, KT88 x 4, 12AU7 x 2, 12AZ7 x 2 W311 x H203 x D438 mm 30.4 kg