For this listing is Sansui 9090DB is a highly coveted, top-tier vintage stereo receiver from 1976–1979, known for its "monster" 125 watts per channel (RMS into 8 ohms) and exceptional warm, clear sound. It features a distinctive black-faced analog tuner, Dolby FM/tape circuitry, and extensive, defeatable tone controls, making it a favorite among,

Flowing circuit board are restored,

(1) F-2653 Equalizer Circuit Board 

(2) F-2544 Tone Control Circuit Board 

(3) F-2624 Driver Circuit Board 

(4) F-2619 Power Supply circuit board of RF Section 

(5) F-2617 Mic Amp Circuit Board 

(6) F-2657 Power Relay Circuit Board 

(7) F-2656 Power Supply Circuit Board 

(8) F-2654 Push Switch Circuit Board 

(9) F-2623 Filter Circuit Board 

(10) F-2694 Dolby Volume Circuit Board and 

(11) F-2655 Dolby NR Circuit Board. 

All the capacitors are high-end and all the signal transistors are modern low noise, unit playing awesome and crystal clear sounding receiver.

Key Specifications & Features: 

Power Output: 125 watts per channel into 8Ω

(min RMS, both channels driven, 20Hz-20kHz).

Total Harmonic Distortion (THD): Less than 0.1%.

Design: Known for its heavy, robust construction (approx. 50-52 lbs) and stunning aesthetic with blue and white meters.

Key Controls: Separate Bass, Midrange, and Treble controls; Dolby Noise Reduction; FM/AM Tuner.

Connections: Two phono inputs, two tape loops, aux input, and terminals for three pairs of speakers.

Distinguishing Features: The "DB" denotes the Dolby board, distinguishing it from the non-DB 9090, which uses a different (quasi-complementary) output topology. 

Common Issues & Value

Condition: Due to their age, these units often require "recapping" (replacing capacitors) and cleaning of the potentiometers (pots) to fix scratchy controls.

Dolby Board: The Dolby board can sometimes be a failure point; however, later models are more reliable.

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