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Arcam Delta 90 Service Manual

Arcam Delta 90
11 pages
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Arcam Delta 90 Specifications

General IconGeneral
Power Output50W per channel into 8Ω
Total Harmonic Distortion (THD)0.02%
Frequency Response20Hz - 20kHz
Signal-to-Noise Ratio100dB
Input Sensitivity150mV
Weight6.5 kg
OutputPreamp Output

Summary

Circuit Description

Disc Input Stage

Describes the input stage for MM/MC cartridges and RIAA equalization, including RF interference rejection.

Input and Record Switching

Explains signal selection for amplification and routing to tape outputs, including CD input attenuation.

Line Amplifier Stage

Details the line amplifier stage providing 18dB gain and volume control with transistor stages.

Tone Control and Direct Switch

Describes the bass/treble tone control circuit and the function of the direct switch.

Power Amplifier Functionality

Amplifier Circuit Operation

Details the single-transistor input stage, class AB operation, and output stage current handling.

Protection and Stability

Covers protection stages for overcurrent/overvoltage and stability measures against oscillations.

DC Servo Circuitry

Explains the DC servo IC for maintaining low DC offset on the loudspeaker output.

System Protection and Power

Speaker Protection and Mute

Describes the amplifier output relay functions for on/off mute and DC offset speaker protection.

Preamplifier Power Supplies

Details the ±15V regulator circuits providing power to preamplifier stages and DC servos.

Maintenance and Safety Warnings

Component Substitution

Provides guidance on replacing components, emphasizing matched pairs for transistors.

Mains Fuse Replacement Safety

Crucial safety warning regarding the replacement of the mains fuse with the correct rating and type.

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