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General| Type | Stereo Receiver |
|---|---|
| Tuning range | FM, MW |
| Frequency response | 20Hz to 20kHz |
| Total harmonic distortion | 0.5% |
| Input sensitivity | 2.5 mV |
| Speaker load impedance | 4-16 ohms |
Explains the functional principles of the Model Twenty-One receiver.
Visual overview of the receiver's main functional blocks and signal flow.
Step-by-step guide for safely taking the unit apart for servicing.
Labeled photograph identifying components on the main circuit boards.
Labeled photograph of the TRF-3 (Tuned Radio Frequency) circuit board.
Labeled photograph of the TIF-2 (Tuned Intermediate Frequency) circuit board.
Labeled photograph of the M-21 Audio Amplifier circuit board.
Instructions and notes for performing voltage and resistance tests.
DC voltage and resistance values for key test points on the TRF-3 board.
DC voltage and resistance values for key test points on the Tuned I.F. Strip #2.
DC voltage and resistance values for key test points on the Audio Amplifier board.
Detailed schematic diagram for the TRF-3 circuit board.
Detailed schematic diagram for the TIF-2 circuit board.
Detailed schematic diagram for the M-21 Audio Amplifier circuit board.
Schematic diagram, component values, and current ratings for the power supply.
Procedures for calibrating and tracking the tuning dial for accuracy.
Step-by-step alignment chart for the TIF-2 and TRF-3 sections.
Visual alignment results and sensitivity checks for IF and Front End.
List of transistors with manufacturer, schematic number, and part numbers.
List of capacitors, coils, and transformers for the TRF-3 board.
List of capacitors, coils, and transformers for the TIF-2 board.
List of capacitors for the Audio Amplifier board.
List of capacitors, rectifiers, transformer, and fuse for the power supply.
The comprehensive schematic illustrating the entire KLH Model Twenty-One system.
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