Hitachi HMA-7500 (c. 1979–1982)
Documentation on the Hitachi HMA-7500 is thin. No service manual or complete spec sheet has surfaced in the Archive's raw research files, so the record rests on period press coverage. High Fidelity (March 1979, p.46) reviewed it as a power amplifier rated at 18 dBW (75 watts) per channel into 8 ohms, with dual peak-responding meters reading in watts and in dB re 100 watts. The same review's IM measurements found the amp delivered substantially the same power into 4-ohm loads, with only a negligible increase in distortion.
Hitachi's own advertising of the period made a point of the MOSFET output stage and was pitched directly at Sony, Technics, Yamaha, and Pioneer owners. A later equipment directory entry in HI-Fi-Stereo-Buyers (1982, p.58) lists the model with low THD, TIM, and IM distortion, frequency response of 7-50,000 Hz ±1 dB, and hum and noise of -100 dB. The page OCR is rough, so treat those figures as approximate. No original price, production totals, or sales history appear in the available sources.
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