Denon PMA-7.5L (1998)

The Denon PMA-7.5L is a compact integrated amplifier from Denon's "point component" series. These are small separates aimed at serious listening in tight spaces, and Russian collectors have nicknamed them the "kitchen" Denons. It came out in 1998 and sold for ¥63,000 in Japan. Documentation is scarce. Owners note that manuals are essentially unfindable, and hifiengine.com doesn't list the model at all.

The interesting part is what Denon packed into the small chassis. The output devices are UHC-MOS (Ultra High Current MOS), a technology the company first introduced in 1993. They run in a single push-pull circuit, a design philosophy inherited from Denon's flagship S1 Series. The left and right channels are physically independent, with separate amplifier circuits and heat sinks to reduce crosstalk. A source direct switch bypasses the tone control circuit entirely for a cleaner signal path. The supplied remote handles power, volume, and source selection. Infrequently used keys hide behind a slide door on the front panel.

Power is 45W + 45W into 8 ohms, and 90W + 90W into 4 ohms per EIAJ. It doubles down into lower impedances, which is typical of a high-current design. THD is rated at 0.07% (1 kHz, 8 Ω). The phono stage is MM only and offers 80 dB S/N at 5 mV input. Line inputs hit 100 dB S/N with source direct engaged. Dimensions are 250 × 112 × 376 mm, and it weighs 6.9 kg. The round power buttons on the front panel appeared only with the 6.5L/7.5L generation in 1998. The earlier PMA-7.5 (1991) and PMA-7.5S (1993) are different models. The names are similar, but they predate UHC-MOS and lack the L-series refinements.

The PMA-6.5L, released at the same time, shares the same internal construction. Collectors describe the series as "very secretive" - little documented, but with quite a lot of auction listings available. Audio Database's entry confirms the UHC-MOS adoption and the S1 lineage, and it is the most authoritative source on the model's design intent.