Sansui AU-D5 (1980–1982)
A 9.6 kg book-shelf integrated with a moving-coil phono stage, concentric tone controls, and a reputation for running hot.
Overview
The AU-D5 gets lost in Sansui's catalog. It isn't the flagship and it isn't the bargain loss leader. It's the middle child with the full feature set. Sansui built it from 1980 to 1982. It measures 430 x 148 x 328mm in a metal case and weighs 9.6 kg. The low-profile book-shelf chassis stacks under a tuner without trouble. Front panels came in both black and silver, so buyers could match whatever else was in the rack.
The power rating is where the documentation splits, so sort that out first. Period press gave the AU-D5 as 50 watts per channel into 8 ohms from 20-20,000 Hz at 0.05% THD. The same figure appears twice in the 1981 coverage, so it's the number the contemporary literature settled on. Later spec aggregators list 65 watts per channel into 8Ω with a 0.02% THD figure and a simpler 20Hz-20kHz frequency response. The two sets of numbers don't reconcile, and no single source wins cleanly. The 50-watt, 0.05% version is a period citation. The 65-watt, 0.02% version shows up in the resale documentation that tends to circulate with the units themselves. Buyers comparing listings will see both. What's not in dispute is the minimum speaker load of 8 ohms, which rules out the low-impedance exotics some bigger Sansuis will drive.
The feature list is where the AU-D5 earns its place in the line. It has full complementary circuitry in the output stage, a stepped volume control rather than a plain pot, separate bass and treble controls, and a subsonic filter for taming rumble from warped vinyl or footfall. There are dual power level indicators on the front. The phono section handles both moving-magnet and moving-coil cartridges, a step up from the MM-only stages that were still common at this price point in the early '80s. Line output is 200mV, with sensitivity quoted at 55dB for MM and 90dB for line inputs.
Key Features
MM/MC Phono Switching
Most integrated amplifiers of this era gave you a moving-magnet input and left it there. The AU-D5 switches between MM and MC. A low-output moving-coil cartridge can be plugged in without an outboard step-up transformer or head amp, which means fewer boxes and fewer cables in the signal path. That's a meaningful inclusion for a mid-range unit. The switching is part of the front-panel control set, alongside loudness and the tape-copy functions.
Concentric Treble Level and Turnover Controls
Instead of a single treble knob, the AU-D5 uses concentric controls. The user adjusts both the amount of treble boost or cut and the turnover frequency where that adjustment begins to take effect. That's more precise than a fixed-frequency treble control, and it shows up in the period coverage as a distinguishing feature. The bass side gets its own level and turnover adjustment too, so the tone section is more flexible than the two-knob setup most buyers would have expected at this level.
Rec-Out Selector with Tape-Copy Function
The recording section includes a dedicated rec-out selector with a tape-copy function, which allows dubbing between two connected decks without repatching cables. Full tape-copy capabilities are cited in the 1981 coverage, and the rec-out selector shows up again in the 1983 feature listing. For a two-deck setup, which was still the norm for serious home recordists in this period, it's a practical convenience.
Stepped Volume Control
The volume control is stepped rather than continuously variable. That gives repeatable settings and channel-to-channel tracking that stays consistent through the range. A worn potentiometer that drifts between channels at low listening levels is the thing this avoids. Pushbutton source selection rounds out the front panel: phono, tuner, AUX, tape 1, tape 2. Speakers A and B get their own pushbuttons.
Dual Power Level Indicators and Subsonic Filter
Two power meters or level indicators sit on the front panel, one per channel, giving a visual read on output. The subsonic filter is the other practical addition. It rolls off the very low frequencies that waste amplifier headroom and can send woofers into visible excursion on warped records. Both features are cited in the 1981 period coverage.
Historical Context
The AU-D5 sat in the middle of Sansui's early-'80s integrated lineup. The 1981 review that placed it at 50 watts per channel also mentioned the higher-spec'd AU-D9 - 95 watts, $650 - which suggests the D5 was positioned below it in both power and price. Russian-language coverage describes the AU-D5 as apparently a mid-range unit in a lineup topped by the AU-D11 and AU-D9, which lines up with the period evidence. The record doesn't show the AU-D5's own original price or its exact place in the hierarchy. Those details remain unrecorded. The model shares a service manual with the AU-D7, which is the closest sibling in the range and the one most often grouped with it in documentation and repair guides.
Collectibility & Value
The AU-D5 is not a collector's trophy, but it has a following. One recent listing for a "Vintage Sansui AU-D5 Integrated Amplifier Linear A & DD/DC" carried a $588 asking price. That's a single data point, and the same search results page surfaced other Sansui models at $245, $360, and $309, so the D5's number should be treated as an outlier until more sales are recorded. The "Linear A & DD/DC" designation in that listing title matches the model name as recorded in the Radiomuseum entry. Whether those descriptors appear on the unit itself or are seller-added language is not confirmed.
The known complaint is heat. Owners report the AU-D5 runs extremely hot compared to other amplifiers they've used. The service manual bias figures are 33 mV and 50 mV bias current, depending on which figure you're reading, and they come with a user warning that 85 mV is too hot. Anyone buying one should plan on checking bias and considering the heatsink modification some owners have discussed. The blue power meter bulbs are a known service item, covered in repair videos for the AU-D5 and AU-D7. Service manuals and owner's manuals are both available, and the owner's manual runs 16 pages. At least one vendor offers reconditioned units with full service. Sound quality gets positive notes from owners. One Russian-language review describes good soundstage, detail, and lively timbres despite the low price, and at least one listener calls it a good match for trance music thanks to its rich, warm presentation.
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