Garden Grove, CA, United States
About this listing
MARANTZ 4400 FLAGSHIP QUADRAPHONIC RECEIVER – CUSTOM BLACK – WC-43 WOOD CASE – RESTORED – 1-YEAR WARRANTYProfessionally Restored by HQaudios – Fully Tested – Backed by Our 1-Year Warranty.1. OVERVIEWUp for sale is the Marantz 4400, the flagship of Marantz's quadraphonic receiver line from the mid-1970s and one of the most sought-after Marantz receivers of the era.The defining feature of the 4400 is its built-in CRT oscilloscope, used for multipath tuning and real-time audio waveform display. Its four independent amplifier channels deliver 50 watts each in quadraphonic mode and can be bridged to 125 watts per channel in stereo. The 4400 also features the Gyro-Touch tuning wheel, Dolby noise reduction, Vari-Matrix synthesis, and a socket for optional matrix/CD-4 decoders.This unit has been professionally restored, serviced, and tested by HQaudios. This particular unit features a custom black front-panel finish and comes with the Marantz WC-43 walnut wood case shown in the photos, included at no extra cost.2. IMPORTANT FUNCTIONAL NOTEThe AM/FM tuner section is not functional because the tuning capacitor is damaged and no replacement part is currently available. The amplifier, phono stage, tape inputs, quadraphonic / Vari-Matrix circuitry, and oscilloscope have been serviced and tested. This receiver is therefore offered as a restored amplifier / phono / oscilloscope unit with a non-working tuner.3. KEY HIGHLIGHTSMarantz 4400 flagship quadraphonic receiverCustom Black Front-Panel FinishBuilt-in CRT Oscilloscope125 Watts x 2 in stereo mode / 50 Watts x 4 in quadraphonic modeDolby Noise Reduction + Vari-MatrixAM/FM tuner not functional – damaged tuning capacitorMarantz WC-43 Walnut Wood Case IncludedProfessionally restored and serviced by HQaudios1-Year HQaudios Warranty4. COSMETIC CONDITIONThis unit is in Very Good restored vintage cosmetic condition, with visible but moderate age-related wear consistent with a 1970s component.Please review all photos carefully, as they are an important part of the description.Custom Black Front Panel: This unit features a custom black front-panel finish. The lettering and controls remain clearly readable.Dial Glass / Front Glass: The front glass shows light surface scratches and scuffs visible under close inspection and certain lighting angles. These marks are cosmetic and should be considered part of the unit's vintage condition.Oscilloscope CRT: The screen is clear and produces a bright, responsive trace.Knobs / Controls / Sliders: The knobs, push-buttons, and balance sliders are intact and operate after service.Top Heat-Sink / Vent Area: A few of the metal cooling fins / vent slots show minor bending. This area is largely covered from normal view when the included WC-43 wood case is installed.Wood Case: The included Marantz WC-43 walnut wood case presents well overall with normal age-related wear and covers the top chassis / cooling area during normal use.Rear Panel / Connections: Speaker terminals, RCA inputs, AM ferrite antenna, and rear-panel hardware are present and securely mounted.5. HQAUDIOS RESTORATION & TESTING PROCESSBEFORE RESTORATIONThe Marantz 4400 was carefully inspected upon arrival to evaluate its mechanical, electrical, operational, and cosmetic condition. Particular attention was given to the power supply, high-voltage CRT oscilloscope circuit, four amplifier stages, phono board, Vari-Matrix circuitry, Dolby processing board, tuner section, controls, sliders, and dial illumination.DURING RESTORATIONThe power supply was repaired, and the high-voltage supply for the oscilloscope CRT was repaired to restore a stable trace.Components replaced on this unit included:2 × 470µF / 100V electrolytic capacitors4 × 220µF / 50V electrolytic capacitors20 × 47µF / 25V electrolytic capacitors10 × 2SC1815 transistors20 × 2SA1015 transistors10 × 22kΩ 1/2W resistors3 × 1N5408 rectifier diodesThe 8V dial and indicator lamps were replaced. The volume potentiometer, tone controls, sliders, and switches were cleaned and treated with contact cleaner. The chassis, faceplate, and wood case were cleaned and detailed.The AM/FM tuner section was found to be non-functional due to a damaged tuning capacitor. As no replacement part is currently available, the tuner section remains non-working.AFTER RESTORATIONOutput power under load, channel balance, quadraphonic decoding, oscilloscope audio modes, tone controls, phono stage, tape inputs, and outputs were tested. The receiver then underwent an extended real-world listening test to evaluate overall stability and operation. The tuner section remains non-functional and is excluded from this functional claim.6. SPECIFICATIONSBrand: MarantzModel: 4400Type: Quadraphonic AM/FM Receiver with Built-in OscilloscopeEra: Mid-1970sPower Output – Stereo: 125 Watts per channel into 8 Ohms x2Power Output – Quadraphonic: 50 Watts per channel into 8 Ohms x4Frequency Response: 20Hz–20kHzTotal Harmonic Distortion: 0.15% at rated powerDamping Factor: 40Inputs: Phono, Aux/CD-4, Tape 1, Tape 2Built-In Tuner: NOT FUNCTIONAL on this unitSpecial Features: Built-in CRT oscilloscope, Dolby noise reduction, Vari-Matrix, decoder socketPower Requirement: 120V AC / 60Hz – Standard U.S. OperationDimensions: Approx. 19.3 W × 5.8 H × 15.3 D inchesWeight: Approx. 53 lbsFinish: Custom Black Front PanelWood Case: Marantz WC-43 Walnut Wood Case IncludedCondition: Restored / Serviced / Tested – Light Front-Glass Scratches; Minor Bent Cooling FinsWarranty: 1-Year HQaudios Warranty7. WHAT IS INCLUDEDMarantz 4400 Quadraphonic ReceiverMarantz WC-43 Walnut Wood CaseOnly the items clearly shown in the photos or specifically listed in the description are included.8. VIDEO TEST & SOUND DEMOIf you would like to see or hear the Marantz 4400 in operation, including the oscilloscope display, please message us through the platform. Additional operational photos or video demonstrations can be provided upon request.
Price$5,999
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