marantz 18 manual

The Marantz 18 is a classic stereo FM tuner from the 1970s, renowned for its exceptional reception quality and build. It features advanced tuning capabilities, multiple input/output options, and the distinctive Marantz blue backlighting. Below are key sections covering features, installation, operation, specifications, and maintenance.

Features at a Glance

Key components: FM stereo tuner with precision tuning meter, signal strength meter, muting control, and Marantz blue backlighting.

Feature	Description
Tuning Range	87.5 to 108 MHz FM
Outputs	Fixed and variable audio outputs
Muting Control	Adjustable threshold for noise suppression
Signal Strength Meter	Visual indicator of reception quality
Tuning Meter	Precision center-tuning indicator
Power Requirements	120V AC, 60Hz
Dimensions	Standard 19-inch rack width
Weight	Approximately 15 lbs

Installation

Unpack and inspect contents. Place on stable surface away from heat sources.

1. Connect antenna: Use 75-ohm coaxial cable to FM antenna input.
2. Connect to amplifier: Use RCA cables from output jacks to amplifier inputs.
3. Plug into AC power outlet.
4. Ensure proper ventilation around unit.

WARNING! Do not place near heat sources or in humid environments. Ensure stable power supply.

First-Time Setup

Power on tuner; allow warm-up time for optimal performance.

1. Connect FM antenna: Ensure proper antenna placement for best reception.
2. Set output level: Adjust variable output control to match amplifier input sensitivity.
3. Tune stations: Use tuning knob and observe tuning meter for precise station selection.
4. Adjust muting: Set muting threshold to eliminate inter-station noise.

CAUTION! Handle with care; unit contains sensitive electronic components.

Specifications

• Tuning Range: 87.5 to 108 MHz FM
• Usable Sensitivity: 1.8 μV (mono)
• Signal-to-Noise Ratio: 70 dB (stereo)
• Capture Ratio: 1.5 dB
• Selectivity: 70 dB
• Image Rejection: 80 dB
• Output Level: Fixed 1V, Variable 0-1V
• Power Consumption: 25 watts
• Dimensions: 19" W × 5" H × 13" D

Controls and Settings

Front Panel: Power switch, tuning knob, signal strength meter, tuning meter, muting control, stereo indicator.

Rear Panel: FM antenna inputs (75 ohm), audio outputs (fixed/variable), AC power cord.

Tuning: Use tuning knob while observing tuning meter for precise station selection. Muting: Adjust to eliminate noise between stations. Output Level: Set variable output to match amplifier requirements.

Connecting to Amplifier

Use high-quality RCA cables for audio connections.

1. Turn off all equipment before making connections.
2. Connect tuner outputs to amplifier auxiliary or tuner inputs.
3. Use fixed output for standard level, variable for adjustable level.
4. Ensure secure connections to prevent signal loss.

Tip: Use shielded cables to minimize interference and noise.

Tuning and Reception

Optimal FM stereo reception techniques.

1. Power on: Allow 15-30 minutes warm-up for stable operation.
2. Select station: Slowly rotate tuning knob while watching tuning meter.
3. Fine tuning: Adjust for maximum center-tune indication.
4. Signal strength: Observe signal meter for reception quality.
5. Muting adjustment: Set to eliminate background noise without cutting out weak stations.
6. Antenna positioning: Adjust FM antenna for best signal strength.

WARNING! Do not force tuning knob; turn gently for precise control.

Maintenance

Regular cleaning and inspection for optimal performance.

Unplug before cleaning. Use soft, dry cloth for exterior; compressed air for dust removal from vents.

CAUTION! Do not use liquids or solvents on controls or faceplate.

Regulatory Information

FCC Part 15: Class B digital device compliant. Manufactured to meet industry standards for FM tuners. Copyright © Marantz. For service and support, contact authorized Marantz service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound output	Connection issues	Check RCA cables; verify amplifier input selection
Poor reception	Antenna problems	Check antenna connections; reposition antenna
No stereo reception	Weak signal	Improve antenna placement; check stereo indicator
Meter not functioning	Internal issues	Check power supply; consult service technician
Hum or noise	Grounding issues	Ensure proper grounding; check cable shielding

Service: Contact authorized Marantz service center for internal repairs.