Denon PMA-540 (1989–1991)
The PMA-540 was Denon's compact integrated amplifier from the late 1980s. It sat between the entry-level PMA-340 and the higher-spec PMA-740 in the company's mini-component series, and it was sold alongside the DCD-540 CD player in matching visual style. It is rated at 50 watts per channel into 8 ohms with 0.05% THD. The design is a straightforward Class A/B, direct-coupled amp with high-current discrete output stages.
The interesting part for its size and price is that it has both MM and MC phono inputs. That is unusual in a compact amp of this class. Owners generally liked the phono stage, and the MM section punches above its weight. The MC stage drew criticism for noise with low-output cartridges and is best avoided. The front panel carries inputs for CD, tuner, and two tape loops, plus bass and treble controls (±8dB at 100Hz and 10kHz respectively), a loudness contour switch, and a Source Direct switch that bypasses the tone circuitry. Engaging Source Direct produces an audible pop.
Audio-Collection reviewed the PMA-540 and noted its obvious family resemblance to the smaller PMA-510, but found the fascia rather cluttered by comparison. The review praised the accurate, smooth control feel but observed that despite the higher power rating over the 510, the power supply wasn't proportionally larger — and as a consequence, low-frequency resolution suffered and the treble could sound "ragged" at higher levels. The reviewer concluded it couldn't be played at the levels its power rating suggested. The magazine gave it five stars for both merit and value at £199. A separate piece in HiFI-Stereo (February 1981, p.59) mentioned Denon's demonstration at the Audio Fair of a new speaker-load compensation circuit in the PMA-540, showing how the amplifier handled reactive loudspeaker impedances better than a conventional design.
The Japanese launch price was ¥29,800. Today the PMA-540 trades modestly on the secondhand market, typically $80-$150 in the US, £120-£180 in the UK, and ¥5,000-¥8,000 on Yahoo Auctions Japan. After decades of use, the common problems are a scratchy volume pot (cleanable with DeoxIT), noisy tone control switches, and cracked plastic speaker binding posts. Replacement posts are no longer available from Denon. The service manual is available via HiFi Engine membership.
Known Specs
- Output: 50W + 50W (8Ω, 20Hz–20kHz, 0.05% THD)
- Frequency response: 5Hz–100kHz
- Damping factor: 100
- S/N ratio: 100dB (MM phono), 105dB (line)
- Inputs: CD, Tuner, Tape 1, Tape 2, Phono MM (2.5mV/47kΩ), Phono MC
- Outputs: Tape 1 REC, Tape 2 REC, Pre-out, Speaker A/B, headphone (6.35mm)
- Power consumption: 170W
- Dimensions: 434 × 89 × 284 mm (also cited as 17.1 × 3.5 × 11.2 inches); 5.8kg
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