Proton D1150 (c. 1988)

Almost nothing is documented about the Proton D1150 outside a single period test report. That report is enough to place it. HI-Fi-Stereo-Buyers (June 1988, p.65) reviewed the D1150 as a power amplifier, and a serious one. Peak power was rated at 400 watts into 2 ohms, with 6 dB of dynamic headroom. Measured distortion typically sat between 0.0015 and 0.0025 percent from 20 to 5,000 Hz. It reached a maximum of 0.0124 percent at 20,000 Hz and 50 watts into 8 ohms.

The review describes a black metal cabinet with extensive ventilation on the top and bottom. Both sets of output transistors and their heat sinks sit in the central portion of the chassis. The front-panel meters read within 2-3 dB of actual output into 8 ohms, with fast attack and slower decay. The same review referenced Proton's earlier D/200 amplifier when situating the D1150's power and distortion figures.

Beyond that review, the record is thin. No production years, original price, or further market history have surfaced.

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