Denon PMA-720 (1988)

The Denon PMA-720 is an integrated amplifier from 1988, originally priced at ¥58,000 in Japan. It's a straightforward, mid-range stereo amp from Denon's late-1980s lineup. The documented record is essentially limited to its published specifications. The model appeared in period dealer advertising as part of Denon's authorized product range, as noted in HiFI-Stereo (June 1990, p.130).

The spec sheet shows a capable amplifier. It delivers 65W + 65W into 6Ω and 50W + 50W into 8Ω (both at 1kHz, 0.4% THD), with a frequency response of 5Hz to 100kHz on the line inputs. The phono stage is flexible for the era, with both MM (2.5mV / 50Ω) and MC (180μV / 100Ω) inputs. Signal-to-noise ratios are 83dB for MM and 74dB for MC. Line inputs rate 105dB S/N. Tone controls are bass and treble, ±8dB at 100Hz and 10kHz respectively. There is also a loudness contour that boosts +7dB at 100Hz at -30dB volume.

The rear panel is minimal: three line inputs, one phono input (switchable between MM and MC), a record output, and two line outputs. The amp measures 434 × 120 × 287mm and weighs 8.2kg.

Beyond the specifications, little is documented about this model. Nothing is known about its circuit topology, its positioning relative to other Denon amplifiers of the period, or its reception in the market.

- **Output:** 65W + 65W (6Ω), 50W + 50W (8Ω), 0.4% THD

- **Phono:** MM 2.5mV / 50Ω, MC 180μV / 100Ω

- **Dimensions:** 434 × 120 × 287mm, 8.2kg