Marantz 2235B Owners Manual

The Marantz 2235B is a classic stereo receiver from the 1970s featuring 35 watts per channel RMS power, high and low filters, loudness contour, tape monitor, phono input, tuner with FM/AM reception, walnut veneer cabinet, and classic blue dial lighting. Below are key sections for operation, features, connections, specifications, and maintenance.

1. Features at a Glance 2. Installation & Setup 3. Front Panel Controls 4. Rear Panel Connections 5. Specifications 6. Basic Operation 7. Tuner Operation 8. Maintenance & Care 9. Troubleshooting 10. Service Information

Features at a Glance

Key components: Power amplifier, preamplifier, FM/AM tuner, input selector, tone controls, walnut cabinet.

Feature	Description
Power Output	35 watts per channel RMS (8 ohms)
Inputs	Phono, Aux, Tuner, Tape 1, Tape 2
Tone Controls	Bass and Treble with defeat switch
Filters	High and Low frequency filters
Loudness Contour	Compensates for low volume listening
Tuner	FM/AM with signal strength meter
Headphone Jack	Front panel 1/4" stereo jack
Power Switch	Main power on/off with indicator light
Volume Control	Dual concentric with balance control
Cabinet	Walnut veneer with metal faceplate

Installation & Setup

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

Connect speakers: Use speaker terminals A or B for 4-16 ohm speakers.
Connect turntable: Use PHONO inputs for magnetic cartridges.
Connect other sources: Use AUX for CD players, tape decks, etc.
Connect antenna: FM 300 ohm terminals for dipole; AM loop antenna.
Plug into AC power outlet.

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

Front Panel Controls

Left to right: Power switch, Input selector, Bass control, Treble control, Loudness switch, High/Low filter switches, Balance control, Volume control, Tuning knob, Function selector, Signal meter, Stereo indicator, Headphone jack.

Input Selector: PHONO, TUNER, AUX, TAPE 1, TAPE 2. Tone Controls: ±10dB at 100Hz (Bass), ±10dB at 10kHz (Treble). Filters: High filter cuts above 7kHz, Low filter cuts below 50Hz.

Rear Panel Connections

Speaker terminals, Input jacks, Antenna terminals, AC outlet, Fuse holder.

Speaker Outputs: A and B systems with screw terminals.
Input Jacks: PHONO, AUX, TAPE 1, TAPE 2 (RCA connectors).
Antenna: FM 300 ohm terminals; AM antenna terminals.
AC Outlet: Switched outlet for turntable or other components.
Fuse: 2A 250V slow-blow fuse for protection.

Tip: Always turn off power before making connections.

Specifications

Power Output: 35 watts per channel RMS at 8 ohms.
Total Harmonic Distortion: 0.3% at rated power.
Frequency Response: 10Hz - 50kHz (+0, -1dB).
Input Sensitivity: Phono 2.5mV, Aux 250mV.
Signal-to-Noise Ratio: Phono 70dB, Aux 85dB.
Tone Controls: Bass ±10dB at 100Hz, Treble ±10dB at 10kHz.
FM Sensitivity: 2.0μV (IHF).
Dimensions: 17-3/8" W × 5-3/4" H × 13-3/4" D.
Weight: 22 lbs.
Power Requirements: 120V AC, 60Hz, 180W.

Basic Operation

Power on: Turn power switch clockwise. Select input source. Adjust volume and tone controls.

Turn power switch to ON position (indicator lights).
Select input: PHONO for turntable, AUX for other sources.
Adjust volume: Start at minimum, increase gradually.
Set tone controls: Bass and Treble to preference.
Use Loudness: Engages bass boost at low volumes.
Headphone use: Plug into front jack (disables speakers).

CAUTION! Avoid maximum volume settings to prevent speaker damage.

Tuner Operation

FM/AM reception with tuning meter and stereo indicator.

Select TUNER input on selector.
Set FUNCTION to FM or AM.
Tune station: Rotate tuning knob for strongest signal.
FM Stereo: Stereo indicator lights when receiving stereo broadcast.
Fine tuning: Use tuning knob for precise station selection.
Antenna adjustment: Position FM antenna for best reception.

Tip: For best FM reception, extend antenna fully and position horizontally.

Maintenance & Care

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

CAUTION! Do not use solvents or abrasives. Keep away from moisture and extreme temperatures.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/fuse	Check power cord connection; replace fuse if blown.
No sound	Input selection/volume	Verify input selector position; check volume setting.
Distorted sound	Overload/speakers	Reduce volume; check speaker connections.
Poor FM reception	Antenna/position	Check antenna connections; reposition antenna.
Noisy controls	Dirt/oxidation	Clean controls with contact cleaner.

Reset: Turn off and unplug for 30 seconds, then restart.

Service Information

For service, contact authorized Marantz service center. Use only original replacement parts. This unit contains no user-serviceable parts inside. Refer to qualified technician for internal service.

Service Centers: Visit www.marantz.com for authorized service locations.