Marantz Model 1060 Service Manual

The Marantz Model 1060 is a classic stereo integrated amplifier from the 1970s, featuring 30 watts per channel RMS power output, high-quality phono inputs for turntables, tuner inputs, auxiliary inputs, and tape monitor circuits. Known for its distinctive blue dial lighting and robust construction, this amplifier delivers warm, detailed sound reproduction. Below are key sections for technical specifications, circuit description, alignment procedures, troubleshooting, and parts list.

1. Technical Specifications 2. Circuit Description 3. Alignment Procedures 4. Block Diagram 5. Voltage Measurements 6. Disassembly Instructions 7. Troubleshooting Guide 8. Replacement Parts List 9. Schematic Diagrams 10. Safety Precautions 11. Service Notes

Technical Specifications

Key electrical and performance characteristics of the Marantz Model 1060 integrated amplifier.

Parameter	Specification
Power Output	30 watts per channel RMS (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion	Less than 0.3% at rated output
Frequency Response	10Hz - 50kHz (+0, -1dB)
Input Sensitivity	Phono: 2.5mV; Aux/Tape: 250mV
Signal-to-Noise Ratio	Phono: 70dB; Aux: 85dB
Tone Controls	Bass: ±10dB at 50Hz; Treble: ±10dB at 10kHz
Power Requirements	120V AC, 60Hz, 150 watts
Dimensions	17" W × 4-3/4" H × 13" D
Weight	22 lbs (10 kg)
Speaker Impedance	4-16 ohms

Circuit Description

Detailed explanation of the amplifier's circuit topology and signal path.

Phono Preamp: High-gain RIAA equalized circuit using discrete transistors
Tone Control: Passive bass and treble controls with buffer amplification
Power Amplifier: Complementary symmetry output stage with driver transistors
Power Supply: Dual secondary transformer with full-wave rectification
Protection Circuit: Fuse protection and thermal safety cutout

WARNING! High voltages present in power supply section. Disconnect from AC power before servicing.

Alignment Procedures

Step-by-step instructions for proper amplifier alignment and calibration.

DC Offset Adjustment: Adjust VR301/VR302 for 0mV DC at speaker terminals
Bias Current: Set idle current to 20mA using test points TP1/TP2
Phono Equalization: Verify RIAA curve accuracy with test records
Input Level Matching: Balance phono and auxiliary input sensitivities

CAUTION! Use insulated tools and follow electrostatic discharge precautions.

Block Diagram

Input Section: Phono, Aux, Tuner inputs with selector switch
Preamp Stage: Phono EQ, tone controls, volume control
Driver Stage: Voltage amplification and phase splitting
Output Stage: Complementary power transistors with emitter resistors
Power Supply: Transformer, rectifiers, filter capacitors, regulators
Protection: Fuses, thermal cutout, speaker protection relay

Voltage Measurements

Reference voltage measurements at key test points with unit operating normally.

Power Supply: +42V DC, -42V DC, +24V DC for preamp section

Output Stage: Collector voltages: +41V, Emitter voltages: +0.6V

Preamp Section: Phono stage: +15V, Tone control: +12V

All measurements referenced to chassis ground. Use high-impedance digital multimeter.

Disassembly Instructions

Proper procedure for accessing internal components for service.

Remove rear panel screws and carefully slide chassis from cabinet
Detach front panel controls and input/output connectors as needed
Note wire colors and connector orientations for reassembly
Keep screws organized by location and size

Tip: Take photos during disassembly for reference during reassembly.

Troubleshooting Guide

Common symptoms and their probable causes with corrective actions.

Symptom	Possible Cause	Corrective Action
No power	Blown fuse, power switch	Check F101/F102; test power switch continuity
Distorted audio	Bias current, output transistors	Adjust bias; test output transistors Q701-Q704
Hum in output	Ground loops, filter caps	Check ground connections; test C601-C604
One channel dead	Driver transistors, input selector	Test Q501-Q502; clean selector switch
Intermittent operation	Cold solder joints, connectors	Resolder main board; check all connectors

Reset: Recalibrate bias and DC offset after component replacement.

Replacement Parts List

Critical replacement components with original Marantz part numbers.

Component	Part Number	Description
Output Transistors	2SC1079/2SA679	Complementary power transistors
Main Filter Caps	CE-62	4700µF 50V electrolytic
Driver Transistors	2SC945/2SA733	Small signal drivers
Fuses	3AG 2A	Slow-blow 2 amp
Volume Control	SV-3	Dual 100kΩ audio taper

Schematic Diagrams

Complete schematic diagrams included in PDF download: Main amplifier, power supply, preamp, tone control, and protection circuits.

Safety Precautions

Always disconnect from AC power before servicing. Use isolation transformer when testing live circuits. Discharge large capacitors before handling. Follow proper grounding procedures.

CAUTION! Lethal voltages present even when unit is switched off.

Service Notes

Factory service bulletins and common modifications. Original service documentation © Marantz 1974. For technical support, contact authorized Marantz service centers. Replacement parts may require cross-referencing to modern equivalents.