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General| Power Output | 250 watts per channel into 8Ω (stereo) |
|---|---|
| Frequency Response | 20Hz to 20kHz |
| Damping Factor | 200 |
| Input Sensitivity | 1.5V |
| Speaker Load Impedance | 4Ω to 8Ω |
| Total Harmonic Distortion | 0.5% |
Identifies the main subject of this supplemental document.
Details new part numbers for Q4 and Q5 transistors and their kit contents.
Covers unit dimensions, weight, power requirements, output power, and performance characteristics.
Guidelines for using correct replacement parts and performing essential electrical safety checks.
Recommended safety measures for handling Electrostatic Discharge Sensitive devices.
A brief description of the Bose 1800/1801 amplifiers' design and features.
Step-by-step instructions for disassembling and assembling the 1801 power amplifier.
Step-by-step instructions for disassembling and assembling the 1800 power amplifier.
Procedures for testing bias adjustment, frequency response, DC offset, power output, and distortion.
Explanations regarding part availability, special components, and usage notes for the part list.
Lists of main components and resistors with part numbers and specifications.
Lists of capacitors, diodes, and transistors used in the amplifiers with their details.
Identifies common issues like DC offset, high current, oscillation, and their potential causes and solutions.
Instructions and diagrams for converting the amplifier between 110V and 220V operation.
Details interchangeability of PCBs and use of toroidal transformers.
Addresses resistor failure and proposes reliability improvement modifications.
Outlines methods to improve the thermal stability of the 1800 amplifier.
Provides information on output transistor changes and compatibility for service.
