Marantz 2250B Owners Manual

The Marantz 2250B is a classic stereo receiver from the 1970s featuring 50 watts per channel RMS power, high and low filters, loudness contour, tape monitor, phono input for turntables, and renowned Marantz build quality. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Power amplifier, preamplifier, tuner section, walnut wood case, blue fluorescent tuning meter.

Installation

Unpack and inspect contents. Place on stable, well-ventilated surface.

1. Connect speakers: Use speaker wire to connect to A and/or B speaker terminals.
2. Connect audio sources: Phono for turntable, Aux for CD player, Tape for recorders.
3. Connect antenna: FM 300 ohm antenna terminals for best reception.
4. Plug into AC power outlet.

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

First-Time Setup

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

1. Select input source: Rotate input selector to desired source (Phono, Aux, Tape).
2. Adjust volume: Start with volume at minimum, gradually increase.
3. Tune FM station: Use tuning knob and meter for precise station selection.
4. Set tone controls: Adjust bass and treble to personal preference.

CAUTION! Always turn volume to minimum before powering on or changing sources.

Specifications

• Power Output: 50 watts per channel RMS at 8 ohms.
• Frequency Response: 10Hz to 50kHz (+0, -1dB).
• Total Harmonic Distortion: 0.1% at rated power.
• Input Sensitivity: Phono: 2.0mV, Aux: 250mV.
• Signal-to-Noise Ratio: Phono: 75dB, Aux: 90dB.
• Tuner Section: FM sensitivity 1.8uV, AM usable sensitivity 50uV.
• Dimensions: 17-3/4" W x 5-7/8" H x 15-1/4" D.
• Weight: 28 lbs.
• Power Requirements: 120V AC, 60Hz.

Controls and Settings

Front panel controls: Power/speaker selector, input selector, volume, balance, bass, treble, loudness, filters.

Rear Panel: Speaker terminals, input jacks, antenna terminals, AC power cord.

Tone Controls: Bass ±10dB at 50Hz, Treble ±10dB at 15kHz. Filters: High filter cuts above 7kHz, Low filter cuts below 50Hz. Loudness: Compensates for Fletcher-Munson curves at low volumes. Balance: Adjusts left/right channel balance.

Connecting Components

Phono: For magnetic cartridge turntables. Aux: For CD players, tuners. Tape: For recording and playback.

1. Turn off receiver before connecting components.
2. Use quality shielded cables for all connections.
3. Connect turntable ground wire to ground terminal.
4. Match input selector to connected source.

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

Operation Guide

Basic operation procedures for optimal performance.

1. Power on: Rotate power knob to speaker selection (A, B, or both).
2. Select source: Choose Phono, Aux, or Tape input.
3. Adjust volume: Use volume control for desired listening level.
4. Tune FM: Use tuning knob and center meter for strongest signal.
5. Use tone controls: Adjust bass and treble to room acoustics.
6. Tape monitoring: Engage tape monitor for recording/playback.
7. Headphone use: Plug headphones into front jack for private listening.

WARNING! Do not operate with cover removed. Avoid excessive volume levels.

Maintenance

Keep unit clean and dust-free. Use soft, dry cloth for cleaning.

CAUTION! Unplug before cleaning. Do not use liquid cleaners. Preserve wood case with appropriate wood care products.

Regulatory Information

FCC compliant for home use. Manufactured to Marantz quality standards. Copyright © 1970s Marantz Company. For historical reference and collector information. This vintage equipment may require service for optimal performance.

Troubleshooting

Service: Vintage audio specialist recommended for any repairs. Original schematics available from Marantz.