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Details specifications for amplifier performance, including output power and distortion.
Details specifications for FM reception, including tuning range and sensitivity.
Details specifications for AM reception, including tuning range and sensitivity.
Describes the initial RF input matching and mixer stage for FM reception.
Details the intermediate frequency amplification and quadrature detection circuit.
Explains the operation of the stereo demodulator and PLL signal generator.
Describes the AM signal processing from antenna to audio output.
Explains the circuit for displaying FM frequencies on the unit.
Explains the circuit for displaying AM frequencies on the unit.
Describes circuitry for proper FM tuning indication and automatic correction.
Details the control logic for the center tune indicators and operation conditions.
Explains the circuitry that locks the tuning to the FM carrier signal.
Details the various audio circuits, including phono preamplifier and tone controls.
Describes the negative feedback configuration for gain and equalization.
Explains the tone control circuits using high gain, low noise amplifiers.
Details how the bass control affects low frequencies through feedback impedance.
Explains how the treble control adjusts high frequencies via feedback.
Describes the midrange control's function at 1 kHz, influencing tone circuit gain.
Details the fully complementary power amplifier design and its components.
Explains the power supply system, including transformer windings and regulation.
Describes the circuit that delays audio output until power stabilizes.
Explains circuitry sensing offset/overload to prevent speaker damage.
Details the circuit for the output power indicator on 355R and 375R models.
Describes the more sophisticated power meter circuit used in the 385R model.
Describes a sensor on the transformer to activate protection if temperature exceeds limit.
Explains the circuit theory behind the temperature sensing and protection activation.
Details the sensor on the heat sink of the 385R for protection against overheating.
Lists the necessary test equipment for performing adjustments.
Procedure for adjusting the AM IF amplifier for optimal performance.
Steps for aligning the AM tuner for accurate tracking across the band.
Procedure for adjusting the FM IF amplifier stages.
Procedure for tracking the FM RF section for optimal signal reception.
Steps to adjust the center tuning indicator for accurate station tuning.
Procedure for adjusting FM circuits to minimize harmonic distortion.
Adjusting the signal strength display for accurate indication.
Procedure for setting the audio mute threshold level.
Adjusting the multiplex pilot signal for proper stereo decoding.
Adjusting for optimal stereo separation between left and right channels.
Procedures for adjusting audio amplifier bias and volume controls.
Setting the DC bias for the output transistors in the audio amplifier.
Adjusting the power output indicator for 355R and 375R models.
Adjusting the power output indicator for the 385R model.
Calibrating the frequency display for 375R and 385R models.
Procedure to adjust the FM frequency display accuracy.
Procedure to adjust the AM frequency display accuracy.
Adjusting the thermal sensor on the power transformer.
Adjusting the heat sink thermal sensor for the 385R model.
Instructions for threading and tensioning the dial cord for the tuning mechanism.
Details power requirements and differences for FIPs in 355R/375R and 385R.
Describes the functions of the FIP for AM/FM signal strength and frequency.
Warnings regarding the fragility and potential damage to glass FIPs.
Provides pin connection diagrams for FIPs used in the models.
Diagrams showing the physical location of components on the tuner, amp, and protection boards.
Diagrams showing component locations on 355R tuner, amp, and protection boards.
Diagrams illustrating the component layout for the display section of 375R/385R.
Diagram showing the component layout for the moving coil preamplifier.
Detailed circuit diagram for the 355R model.
Detailed circuit diagram for the 375R model.
Detailed circuit diagram for the 385R model.
An exploded view of the 385R showing all external and internal components.
Important notes regarding transistor identification, part ordering, and power consumption.
Details specifications for amplifier performance, including output power and distortion.
Details specifications for FM reception, including tuning range and sensitivity.
Details specifications for AM reception, including tuning range and sensitivity.
Describes the initial RF input matching and mixer stage for FM reception.
Details the intermediate frequency amplification and quadrature detection circuit.
Explains the operation of the stereo demodulator and PLL signal generator.
Describes the AM signal processing from antenna to audio output.
Explains the circuit for displaying FM frequencies on the unit.
Explains the circuit for displaying AM frequencies on the unit.
Describes circuitry for proper FM tuning indication and automatic correction.
Details the control logic for the center tune indicators and operation conditions.
Explains the circuitry that locks the tuning to the FM carrier signal.
Details the various audio circuits, including phono preamplifier and tone controls.
Describes the negative feedback configuration for gain and equalization.
Explains the tone control circuits using high gain, low noise amplifiers.
Details how the bass control affects low frequencies through feedback impedance.
Explains how the treble control adjusts high frequencies via feedback.
Describes the midrange control's function at 1 kHz, influencing tone circuit gain.
Details the fully complementary power amplifier design and its components.
Explains the power supply system, including transformer windings and regulation.
Describes the circuit that delays audio output until power stabilizes.
Explains circuitry sensing offset/overload to prevent speaker damage.
Details the circuit for the output power indicator on 355R and 375R models.
Describes the more sophisticated power meter circuit used in the 385R model.
Describes a sensor on the transformer to activate protection if temperature exceeds limit.
Explains the circuit theory behind the temperature sensing and protection activation.
Details the sensor on the heat sink of the 385R for protection against overheating.
Lists the necessary test equipment for performing adjustments.
Procedure for adjusting the AM IF amplifier for optimal performance.
Steps for aligning the AM tuner for accurate tracking across the band.
Procedure for adjusting the FM IF amplifier stages.
Procedure for tracking the FM RF section for optimal signal reception.
Steps to adjust the center tuning indicator for accurate station tuning.
Procedure for adjusting FM circuits to minimize harmonic distortion.
Adjusting the signal strength display for accurate indication.
Procedure for setting the audio mute threshold level.
Adjusting the multiplex pilot signal for proper stereo decoding.
Adjusting for optimal stereo separation between left and right channels.
Procedures for adjusting audio amplifier bias and volume controls.
Setting the DC bias for the output transistors in the audio amplifier.
Adjusting the power output indicator for 355R and 375R models.
Adjusting the power output indicator for the 385R model.
Calibrating the frequency display for 375R and 385R models.
Procedure to adjust the FM frequency display accuracy.
Procedure to adjust the AM frequency display accuracy.
Adjusting the thermal sensor on the power transformer.
Adjusting the heat sink thermal sensor for the 385R model.
Instructions for threading and tensioning the dial cord for the tuning mechanism.
Details power requirements and differences for FIPs in 355R/375R and 385R.
Describes the functions of the FIP for AM/FM signal strength and frequency.
Warnings regarding the fragility and potential damage to glass FIPs.
Provides pin connection diagrams for FIPs used in the models.
Diagrams showing the physical location of components on the tuner, amp, and protection boards.
Diagrams showing component locations on 355R tuner, amp, and protection boards.
Diagrams illustrating the component layout for the display section of 375R/385R.
Diagram showing the component layout for the moving coil preamplifier.
Detailed circuit diagram for the 355R model.
Detailed circuit diagram for the 375R model.
Detailed circuit diagram for the 385R model.
An exploded view of the 385R showing all external and internal components.
Important notes regarding transistor identification, part ordering, and power consumption.
General| Power output | 85 watts per channel into 8Ω (stereo) |
|---|---|
| Input sensitivity | 2.5mV (MM), 150mV (line) |
| Channel separation | 50dB (MM), 55dB (line) |
| Dimensions | 483 x 140 x 381mm |
| Signal to noise ratio | 80dB (MM), 95dB (line) |
| Signal-to-Noise Ratio | 80dB (MM), 95dB (line) |
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