Marantz Model 2275 Receiver Manual

The Marantz Model 2275 is a classic stereo receiver from the 1970s featuring 75 watts per channel RMS power, high-quality amplification, FM/AM tuner with excellent reception capabilities, sophisticated tone controls, multiple input/output options, and the iconic Marantz blue-lit tuning dial. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Tuner Operation 8. Audio Controls 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-power amplifier section, FM/AM tuner, Phono input, Auxiliary inputs, Tape monitor, Headphone jack, Speaker outputs.

Feature	Description
Power Output	75 watts per channel RMS (8 ohms)
Tuner Section	FM/AM with precision tuning meter
Phono Input	MM cartridge compatible with RIAA equalization
Auxiliary Inputs	For tape decks, CD players, other line-level sources
Tape Monitor	Tape input/output with monitor function
Headphone Jack	For private listening
Speaker Selector	A/B speaker switching
Tone Controls	Bass, Treble, and Loudness contour
Filter Switch	High and low frequency filters
Power Switch	Main power on/off with indicator light

Installation

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

Connect speakers: Use speaker wire to connect to A or B speaker terminals.
Connect audio sources: Phono for turntable, Aux for CD/tape players.
Connect antenna: FM antenna to 300 ohm terminals, AM loop antenna.
Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block ventilation slots. Use correct speaker impedance (4-16 ohms).

First-Time Setup

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

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

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

Specifications

Power Output: 75 watts per channel RMS at 8 ohms.
Frequency Response: 10Hz to 50kHz (+0, -1dB).
Total Harmonic Distortion: Less than 0.1% at rated power.
Input Sensitivity: Phono: 2.5mV, Aux: 250mV.
Signal-to-Noise Ratio: Phono: 75dB, Aux: 90dB.
Tone Controls: Bass: ±10dB at 50Hz, Treble: ±10dB at 15kHz.
Power Requirements: 120V AC, 60Hz.
Dimensions: 19-1/2" W x 6-1/4" H x 15-1/2" D.

Controls and Settings

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

Rear Panel: Speaker terminals, Phono/Aux inputs, Tape monitor jacks, Antenna terminals, AC power cord.

Tone Controls: Bass (±10dB at 50Hz), Treble (±10dB at 15kHz). Filters: High cut (7kHz), Low cut (70Hz). Loudness: Compensates for low-volume listening. Balance: Adjusts left/right channel balance. Speaker Selector: A/B speakers on/off.

Connecting Devices

Phono: For turntable with magnetic cartridge. Aux: For CD players, tape decks. Tape: Tape in/out for recording.

Turn off receiver before connecting devices.
Match input types (Phono for turntable only).
Use quality cables for best performance.
Connect antennas properly for optimal reception.

Tip: Keep signal cables away from power cords to reduce hum and interference.

Tuner Operation

FM/AM tuning with signal strength and center tuning meters.

Select Tuner input on selector knob.
For FM: Extend antenna fully, rotate for best reception.
Tune stations: Use tuning knob until center meter is centered.
FM Muting: Reduces noise between stations (adjustable).
AM: Use built-in ferrite antenna or external AM antenna.
Stereo indicator: Lights when receiving FM stereo broadcast.

WARNING! Do not touch antenna terminals while receiver is powered on.

Audio Controls

Bass Control: Adjusts low frequencies. Treble Control: Adjusts high frequencies. Loudness: Boosts bass at low volumes. Balance: Adjusts left/right speaker balance. Filters: Reduce high-frequency hiss or low-frequency rumble.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Clean controls with contact cleaner if scratchy. Keep ventilation slots clear.

CAUTION! Do not use liquids or aerosols near controls or ventilation openings.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 1970s Marantz Company; trademarks of Marantz America. For service and support, contact authorized Marantz service centers. Original manufacturer: Marantz Company, Inc.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker connections/selector	Check speaker wires; ensure speaker selector is on.
Hum or noise	Grounding/cable issues	Check ground connections; separate signal and power cables.
Poor FM reception	Antenna placement	Reposition FM antenna; ensure proper connection.
One channel silent	Balance control/cables	Check balance control; verify input cables properly connected.
Overheating	Ventilation/speakers	Ensure adequate ventilation; check speaker impedance.

Service: Contact authorized Marantz service center for internal repairs.

Note: This vintage equipment may require specialized service by qualified technicians.