Marantz 2440 Manual

The Marantz 2440 is a classic stereo receiver featuring 40 watts per channel, built-in AM/FM tuner, phono input for turntables, tape monitor, loudness control, and tone adjustments. With its distinctive blue-lit analog tuning dial and wood cabinet, it represents the golden era of hi-fi audio equipment. Below are key sections for features, installation, operation, specifications, and maintenance.

Features at a Glance

Key components: Power amplifier, AM/FM stereo tuner, Phono preamp, Tape monitor, Headphone jack, Speaker outputs.

Feature	Description
Power Output	40 watts per channel into 8 ohms
Tuner Section	AM/FM stereo with analog tuning dial
Phono Input	MM cartridge compatible with RIAA equalization
Tape Monitor	Dedicated tape input/output with monitor function
Headphone Jack	Front panel 1/4" stereo headphone output
Speaker Outputs	A/B speaker selector with protection circuit
Tone Controls	Bass and treble adjustments with defeat switch
Loudness Control	Compensates for low volume listening
Filter Switch	High and low frequency filters
Power Switch	Main power on/off with indicator light

Installation

Unpack and inspect contents. Place on stable, level surface.

1. Connect speakers: Use speaker wire to connect to A or B speaker terminals.
2. Connect turntable: Use phono input for magnetic cartridge turntables.
3. Connect tape deck: Use tape monitor input/output for recording/playback.
4. Connect auxiliary sources: Use AUX input for CD players, tuners, etc.
5. Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block heat sinks. Use correct speaker impedance.

First-Time Setup

Power on receiver; allow 30 seconds for warm-up.

1. Select input source: Turn selector knob to PHONO, AUX, or TUNER.
2. Adjust volume: Start with volume at minimum, gradually increase.
3. Tune FM stations: Use tuning dial and stereo indicator for best reception.
4. Set tone controls: Adjust bass and treble to preference.
5. Engage loudness: Use for low volume listening enhancement.

CAUTION! Do not operate with speaker wires touching each other or chassis.

Specifications

• Power Output: 40 watts RMS per channel, 8 ohms, 20Hz-20kHz
• Total Harmonic Distortion: 0.3% at rated power
• Frequency Response: 10Hz-50kHz (+0, -3dB)
• Input Sensitivity: Phono: 2.5mV, AUX: 150mV
• Signal-to-Noise Ratio: Phono: 70dB, AUX: 90dB
• Tuner Section: FM sensitivity: 2.0μV, AM sensitivity: 50μV
• Dimensions: 17-1/2" W × 5-1/4" H × 14" D
• Weight: 22 lbs
• Power Requirements: 120V AC, 60Hz, 180 watts

Controls and Settings

Front Panel: Power switch, Input selector, Volume, Balance, Bass, Treble, Loudness, Filter, Speaker selector.

Rear Panel: Speaker terminals, Phono input, AUX input, Tape monitor, AC power cord.

Input Selection: PHONO, AUX, TUNER. Tone Controls: Bass ±10dB at 50Hz, Treble ±10dB at 10kHz. Filters: High cut 7kHz, Low cut 70Hz. Loudness: Compensates Fletcher-Munson curves. Balance: Left/right channel adjustment.

Connecting Components

Speakers: A/B selector supports two pairs. Sources: Phono for turntables, AUX for other line-level sources.

1. Turn off power before making connections.
2. Match cable polarity (red to red, black to black).
3. Use proper grounding for turntable.
4. Ensure tape deck connections are correct for monitor function.

Tip: Use high-quality interconnects and speaker wire for best performance.

Tuner Operation

AM/FM stereo tuner with analog dial and signal strength meter.

1. Select TUNER input on selector knob.
2. Adjust tuning dial for desired station.
3. Monitor stereo indicator for FM stereo reception.
4. Use fine tuning for optimal FM reception.
5. Adjust antenna for best signal strength.

Note: FM stereo requires adequate signal strength for noise-free reception.

Audio Adjustments

Tone controls, filters, and loudness compensation for optimal listening.

1. Bass Control: Adjust low frequency response.
2. Treble Control: Adjust high frequency response.
3. Tone Defeat: Bypass tone controls for flat response.
4. Loudness: Engage for enhanced bass at low volumes.
5. Filters: Reduce high frequency hiss or low frequency rumble.
6. Balance: Adjust left/right channel balance.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Clean controls with contact cleaner if noisy.

CAUTION! Do not use liquids or solvents on wood cabinet. Keep away from moisture and extreme temperatures.

Technical Information

UL listed. Manufactured to Marantz quality standards. Uses silicon transistors and premium components. Service available from authorized Marantz service centers. For technical support, contact Marantz customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/input selection	Check speaker wires; verify input selection; ensure volume up.
Distorted sound	Overload/clipping	Reduce volume; check source level; verify speaker impedance.
Hum or noise	Grounding issues	Check turntable ground; ensure proper cable routing.
One channel dead	Connection/balance	Check balance control; verify cable connections; test speakers.
Poor FM reception	Antenna/tuning	Adjust FM antenna; fine tune station; check antenna connection.
Lights not working	Bulbs/power	Check power connection; replace dial lights if necessary.

Service: Contact authorized Marantz service center for internal repairs.

Note: This unit contains high voltages - do not attempt internal repairs unless qualified.