Denon PMA-1000G (1993)

Name: Denon PMA-1000G
Brand: Denon

The Denon PMA-1000G is a Japanese-market integrated amplifier from 1993, originally priced at ¥89,800. It was sold only in Japan, so it runs on 100V AC and needs a step-down transformer anywhere else. Surviving examples usually turn up through Japanese auction channels or specialty dealers, and it's something of a collector's rarity today.

The power amp section uses Denon's "New Super Optical Class A" circuit. It's a bias control scheme that runs the output stage in pure Class A up to typical listening levels, then switches to a non-switching Class A mode at higher output to avoid crossover distortion. The unusual part is that the control signal from the bias circuit reaches the bias stage through an optical element. Denon says this completely eliminates mutual interference between the main signal path and the bias control circuitry. A large toroidal transformer handles power supply duties, and Denon touted its stable current delivery, low leakage flux, and vibration resistance.

Denon's stated design philosophy for the PMA-1000G was "simple and straight ideas." In practice that means a low-impedance volume control to improve signal-to-noise at normal listening levels, a source direct function that bypasses tone controls, loudness, and the subsonic filter entirely, and a careful physical layout of switches and boards to keep the signal path from input to speaker terminals as short as possible.

Specs are respectable for the era and the price point. Output is 90W + 90W into 8Ω and 110W + 110W into 6Ω, with dynamic power rated at 200W (4Ω) and 250W (2Ω). THD is listed at 0.007% (1kHz, 45W, 8Ω). The phono stage handles both MM and MC cartridges. MM sensitivity is 2.5mV/47kΩ, MC is 0.2mV/100Ω, and RIAA deviation is ±0.3 dB. Signal-to-noise is 94 dB (MM), 76 dB (MC), and 110 dB on line inputs. It weighs 12.0 kg and measures 470 × 167 × 400 mm. Power consumption is rated at 207W.

Documentation in English is thin. The technical data above comes primarily from audio-database.com, and most of the contemporary discussion of this model lives in Russian-language forums and classifieds. What little owner commentary exists is enthusiastic. One Russian source describes it as embodying the philosophy of uncompromising quality typical of top models for discerning listeners, with particular strengths on instrumental music and vocals, and an ability to drive difficult low-impedance speakers thanks to the power supply's current capability. The same source advises professional servicing after any purchase, from someone familiar with Japanese-market equipment, since service documentation is hard to find.

One recurring question from prospective buyers, posed on a Russian forum: is it better than a Sansui Alpha 607, its contemporary? The thread asks the question but doesn't definitively answer it. If you're considering one, factor in the 100V requirement and the need for a service check after decades of inactivity — but for a Japanese-market Denon from 1993, the PMA-1000G appears to be a genuinely well-engineered amplifier that deserves its quiet reputation.