Proton D-940
Documentation on the Proton D-940 is thin, but the period press left a clear picture of a receiver built with digital audio in mind. Audio (July 1986, p.81) reviewed it as a 40-watt-per-channel receiver that could deliver short-term peaks of 160 watts into 8-ohm loads, or 280 watts into 4-ohm loads. In listening tests, the same reviewer found it drove his inefficient speakers better than his reference 90-watt amplifier, and credited the generous dynamic headroom (Audio, July 1986, p.86).
Measurements from the same issue backed up the listening results. Short-term power output held up remarkably well down to 2-ohm loads, and it put out a full 280 watts per channel into 4 ohms (Audio, July 1986, p.84). The FM tuner measured well too. The 19- and 38-kHz components were 70 dB below maximum modulation, SCA rejection exceeded 66 dB, image and AM suppression both measured 60 dB, and i.f. rejection was 92 dB. Phono S/N was 81 dB for MM and 71.5 dB for MC. Volume-control noise was -89 dB relative to 1 watt.
Beyond those review measurements, little is documented. The Archive has no confirmed production years, original price, or further design details.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.