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 produced from 1987 to 1990. Built in Japan, it features an "Optical Class A" circuit design and delivers 70 watts per channel into 8 ohms. It includes MM/MC phono input, headphone output, and supports two sets of speakers. The unit was offered 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, It carries the internal part designation 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 range from $30 at yard sales to €235 online, with units often described as in good or excellent condition. One user has reported an intermittent left channel failure, suggesting potential reliability issues in aged units.
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