Marantz 3800 Manual

The Marantz 3800 is a high-performance stereo preamplifier featuring advanced audio processing, multiple input/output options, precision tone controls, and professional-grade construction. This manual covers essential information for setup, operation, and maintenance of your Marantz 3800 preamplifier.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Audio Processing 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-quality preamplifier circuitry, precision volume control, multiple input selection, tone controls, and professional connectivity options.

Feature	Description
Input Selection	Multiple source inputs including Phono, CD, Tuner, Aux
Tone Controls	Bass, Treble, and Mid-range adjustment
Volume Control	Precision stepped attenuator
Balance Control	Left/Right channel balance adjustment
Headphone Output	Front panel headphone jack
Power Supply	Stabilized power circuitry
Input/Output	RCA connectors for all inputs and outputs
Phono Stage	MM/MC phono input with adjustable loading
Tape Monitor	Tape input/output with monitoring capability
Power Switch	Main power on/off control

Installation

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

Connect audio sources: Use high-quality RCA cables to connect CD player, turntable, tuner, etc.
Connect to amplifier: Use RCA cables to connect preamp output to power amplifier inputs.
Connect tape deck: Use tape input/output for recording and monitoring.
Plug into AC power using provided power cord.

WARNING! Ensure proper ventilation; do not block ventilation openings. Use stable power source.

First-Time Setup

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

Select input source: Rotate input selector to desired source (Phono, CD, Tuner, Aux).
Set volume: Start with volume at minimum, gradually increase to desired level.
Adjust tone controls: Set to flat position initially, adjust to preference.
Balance adjustment: Center balance control for equal left/right output.

CAUTION! Always turn volume to minimum before powering on/off to prevent speaker damage.

Specifications

Frequency Response: 20Hz - 20kHz ±0.5dB
Total Harmonic Distortion: <0.005%
Signal-to-Noise Ratio: >90dB
Input Sensitivity: Phono: 2.5mV, Line: 150mV
Input Impedance: Phono: 47kΩ, Line: 50kΩ
Output Level: 1V RMS maximum
Tone Control Range: ±10dB at 100Hz and 10kHz
Power Requirements: 120V AC, 60Hz, 15W
Dimensions: 17" W × 4.5" H × 12" D
Weight: 15 lbs

Controls and Settings

Front Panel: Power switch, Input selector, Volume control, Balance control, Tone controls, Headphone jack.

Rear Panel: Input connectors (Phono, CD, Tuner, Aux), Output connectors (Main, Tape), Power cord input.

Tone Controls: Bass (±10dB at 100Hz), Treble (±10dB at 10kHz). Input Selection: Phono, CD, Tuner, Aux 1, Aux 2. Special Features: Loudness compensation, Mono/stereo switch, Tape monitor.

Connecting Devices

Audio Sources: Phono, CD player, Tuner, Tape deck. Output: Power amplifier, Tape recorder.

Turn off all equipment before making connections.
Use high-quality shielded audio cables.
Match left/right channels (white/red RCA connectors).
Connect phono ground wire to ground terminal.

Tip: Keep signal cables away from power cords to minimize interference.

Audio Processing

Advanced audio processing features for optimal sound quality.

Phono equalization: RIAA equalization curve for vinyl playback.
Tone control: Independent bass and treble adjustment.
Loudness compensation: Automatic bass boost at low volumes.
Balance control: Precise left/right channel balance.
Tape monitoring: Real-time monitoring of tape recording.
Headphone output: High-quality headphone amplification.

WARNING! Do not connect turntable directly to line inputs; use phono input only.

Maintenance

Regular maintenance ensures optimal performance and longevity.

Cleaning: Use soft, dry cloth for exterior; avoid chemicals.
Connectors: Periodically clean RCA connectors with contact cleaner.
Ventilation: Ensure adequate airflow around unit.
Storage: Keep in dry, dust-free environment when not in use.

CAUTION! Unplug unit before cleaning. Do not open chassis; no user-serviceable parts inside.

Regulatory Information

FCC Part 15: Class B digital device compliant. Manufactured to meet international safety standards. Copyright © Marantz. All rights reserved. For technical support and service, contact authorized Marantz service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound output	Volume control/Cables	Check volume setting; verify cable connections; ensure power amplifier is on.
Hum or noise	Grounding/Cables	Check phono ground connection; use shielded cables; separate from power cords.
Distorted sound	Input level/Connections	Reduce source output level; check for proper connections; verify input selection.
One channel silent	Balance/Cables	Check balance control; verify both channel cables connected; test with other source.
Intermittent operation	Connectors/Power	Clean RCA connectors; check power cord connection; inspect for loose internal connections.

Service: Contact authorized Marantz service center for internal repairs.

Warranty: Refer to warranty documentation for coverage details.