Denon PMA-520 (1987–1990)
A Japanese-built integrated stereo amplifier from the late 1980s with Optical Class A design and 70 watts per channel into 8 ohms.
Overview
The Denon PMA-520 is an integrated stereo amplifier made from 1987 to 1990. It was built in Japan and uses an "Optical Class A" circuit design. Output is 70 watts per channel into 8 ohms. It has an MM/MC phono input, a headphone output, and terminals for two sets of speakers. The unit came in a champagne finish and carries the part designation IU-1623-4.
Specifications
| Power output | 70 + 70 Watts (8Ω, stereo) |
| Continuous Power 4Ω | 110 + 110 Watts |
| Frequency response | 20Hz to 20kHz |
| Speaker Outputs | 2 x 2 Speakers |
| Headphone socket | Yes |
| Phono | MM/MC |
| Color | Champagne |
| Made in | Japan |
| Original price | 700 DM |
Design
The amplifier uses an "Optical Class A" circuit design. Its internal part designation is IU-1623-4.
Product Family
The PMA-520 was part of a series that included the Denon PMA-720, PMA-920, and PMA-1520.
Market
Recent resale prices run from $30 at yard sales to €235 online. Units are often described as in good or excellent condition. One user has reported an intermittent left channel failure, which suggests aged units may have reliability problems.
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