McIntosh
American amplifier maker in Binghamton, New York; valve amplifiers such as the MC275.
Frank McIntosh founded the company to make amplifiers with low distortion, and it moved to Binghamton, New York. He developed a new kind of output transformer.
The amplifiers with black glass fronts and blue meters became the brand's hallmark. McIntosh still manufactures in Binghamton.
The black glass front with blue meters.