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Revox A76

Revox A76
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Revox A76 Specifications

General IconGeneral
BrandRevox
ModelA76
CategoryTuner
LanguageEnglish

Summary

1. GENERAL

2. DISMANTLING

2.1. Removal of front panel

Steps to remove the front panel by pulling knobs and fasteners.

2.2. Removal from cabinet

Steps to remove the chassis from the cabinet after removing screws and spacers.

2.3. Lacing of dial cord

Instructions for lacing the dial cord using steel wire and nylon cord.

3. CIRCUIT DESCRIPTION

3.1. Operating controls

Identifies operating controls by index numbers matching the Operating Instructions.

3.2. Schematics

Lists the available schematics (block, interconnecting, complete circuit diagrams).

3.3. RF input section (front end)

Describes the RF input stage, including FET and mixer components.

3.4. IF-section

Details the IF section with passive filters and integrated amplifier circuits.

3.5. Demodulator

Explains the delay-line demodulator and its components for FM signal processing.

3.6. Subcarrier re-generation

Describes the 38 kHz subcarrier regeneration using a phase locked loop oscillator.

3.7. Multiplex decoder

Explains the switching principle of the multiplex decoder for channel separation.

3.8. Indicator circuits

Covers auxiliary circuits for tuning indication and automatic functions like muting.

3.9. Power supply

Details the power supply section with electronically regulated voltage outputs.

4. ALIGNMENT INSTRUCTIONS

4.1. Test equipment

Lists the required test equipment for alignment procedures.

4.2. Additional tools and filters

Lists necessary tools and filters for measurements and adjustments.

4.3. Checking of supply voltages

Outlines the procedure for checking supply voltages before alignment.

4.4. Tuning of IF filters

Instructions for tuning the IF filters for maximum output voltage.

4.5. Alignment of center tuning discriminator

Procedure for aligning the center tuning discriminator after IF filter tuning.

4.6. Checking the selectivity

Method for checking bandwidth and static selectivity of the tuner.

4.7. Alignment of RF input section

Steps to align the RF input section and oscillator circuits.

4.8. Alignment of IF amplifier

Instructions for aligning the IF amplifier transformer coupling.

4.9. Checking symmetry of the center tuning meter (44)

Procedure to check and correct the symmetry of the center tuning meter.

4.10. Checking for correct limiting

Steps to verify correct limiting action in the IF amplifier.

4.11. Sensitivity check on the center tuning (44) and the signal strength meters (43)

Checks the sensitivity of the tuning and signal strength meters.

4.12. Alignment of FM demodulator

Procedure for aligning the FM demodulator for minimum distortion.

4.13. Alignment of multipath indicator

Steps to align the multipath indicator circuit.

4.14. Alignment of subcarrier oscillator (76 kHz)

Procedure to tune the 76 kHz subcarrier oscillator coil.

4.15. Alignment of 19 kHz circuit

Steps to adjust the 19 kHz circuit and check the stereo indicator.

4.16. Alignment of 38 kHz circuit

Procedure to tune the 38 kHz circuit for envelope crossover.

4.17. Tuning of the 19 kHz band pass filter

Instructions for tuning the 19 kHz band pass filter for envelope crossover.

4.18. Alignment of multiplex filter

Procedure to adjust multiplex filters for minimum MPX-signal.

4.19. Adjustment for minimum stereo crosstalk

Steps to adjust for minimum stereo crosstalk between channels.

4.20. Checking of automatic mono-stereo changeover (level-dependent)

Verifies the automatic mono-stereo changeover function.

4.21. Checking range of output potmeters

Checks the function and attenuation range of output potentiometers.

5. INSTRUCTIONS FOR MEASURING THE MOST IMPORTANT PERFORMANCE DATA

5.1. Input sensitivity

Measures input sensitivity for mono and stereo modes.

5.2. Measuring static selectivity

Refers to section 4.6.6 to 4.6.7 for static selectivity measurement.

5.3. Image response

Measures the tuner's image response performance.

5.4. Spurious response

Measures the tuner's spurious response characteristics.

5.5. Distortion

Measures the total harmonic distortion in mono mode.

5.6. Signal to noise ratio

Measures the signal to noise ratio.

5.7. Stereo separation (crosstalk)

Measures the stereo separation or crosstalk between channels.

5.8. Frequency response

Measures the frequency response across different modulating frequencies.

6. TECHNICAL DATA

7. SCHEMATICS

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