Denon PMA-7.5S (1993)
The Denon PMA-7.5S is a pre-main (integrated) amplifier from Denon's PRESTA mini-component series. It came out in 1993 at ¥49,800. It followed the 1991 PMA-7.5. What the "S" added over the original isn't documented in the sources that list both models, and they don't establish a definitive difference.
It's a compact amp: 250mm wide, 96mm tall, 335mm deep, and 5.5kg. Rated output is 45W + 45W into 8Ω (20Hz-20kHz) with THD of 0.008% at 22.5W. It can work into 2Ω loads, where it delivers 120W + 120W of dynamic power. Maximum practical power is listed at 80W + 80W into 6Ω (EIAJ).
The power supply uses a toroidal transformer, chosen for low leakage flux and good vibration behavior. A low-impedance volume control improves the signal-to-noise ratio at normal listening levels. Line S/N is rated at 100dB with source direct engaged. The source direct switch bypasses the tone controls entirely. The phono stage is a high-quality RIAA design that accepts MM cartridges at 2.5mV/47kΩ. The included remote controls the amplifier and also compatible Denon CD players, cassette decks, and tuners, which is handy for a mini-system of this era. Denon recommended pairing it with the SC-E232 speakers.
Documentation on this model is thin. Manuals are essentially impossible to find free online. The model gets only a passing mention on hifi-wiki.de and nothing at all on hifiengine. Japanese-market auction listings do circulate, with bids ranging from ¥3,000 to ¥7,700 on Yahoo Auctions and similar venues. Some units sold as junk or "electrification only," so condition varies widely.
Audio Database (audio-database.com) lists the full specifications above, including the 1993 release date and ¥49,800 original price.
Known Specs
- Rated output: 45W + 45W (20Hz–20kHz, 8Ω)
- Dynamic power: 120W + 120W (2Ω)
- THD: 0.008% (1kHz, 22.5W, 8Ω)
- Phono MM: 2.5mV / 47kΩ, S/N 84dB
- Line: 150mV / 15kΩ, S/N 100dB (source direct on)
- Tone controls: Bass ±8dB (100Hz), Treble ±8dB (10kHz)
- Power consumption: 96W
- Dimensions: 250 × 96 × 335 mm; 5.5kg
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