Marantz 1150D (1976)
Almost everything known about the Marantz 1150D comes from one period review. Audio (March 1976, p.52) ran Leonard Feldman's equipment profile of it as a "control amplifier." It was essentially the Marantz Model 1150 integrated amplifier with a built-in Dolby noise reduction section. The review notes that the plain 1150 sold for less precisely because it lacked the Dolby circuits.
The 1150D has a vertically deflecting meter at center panel, paired with a built-in 400 Hz tone generator. The meter doubles as a Dolby calibration level meter, and the amplifier can encode Dolby for recording. It is rated at 75 watts per channel from 20 Hz to 20 kHz. In testing it delivered its full rated power at any frequency from 16 Hz to 29 kHz at or below 0.1% THD (see Audio, March 1976, p.57). Distortion stayed below 0.07% over most of the band. At rated output the residual was almost entirely third-order harmonic, some 64 dB down.
Beyond that review, the record is thin. The archive's sources document no production dates, original price or further specifications.
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