Proton D940

Repair

Taiwan 1986

Tuner
FM
Sensitivity 1.5 µV
Muting mono 4 µV
Muting stereo 35 µV
Distortion at 1 kHz 0.3%
Signal to noise ratio at 65 dBf mono 78 dB
Signal to noise ratio at 65 dBf stereo 68 dB
Capture ratio at 45 dBf 2.5 dB
Selectivity at 45 dBf 65 dB
Spurious rejection75 dB
65 dB image rejection
IF rejection 95 dB
AM suppression at 65 dBf 53 dB
Stereo separation at 1 kHz 40 dB
Output level 450-850 mV

AM
Sensitivity 800 µV / m
Sulttivity 30 dB
Image rejection 30 dB
IF rejection 45 dB
AGC 45 dB
Harmonic distortion at 400 Hz 30% modulation 1%
Audio bandwidth 200Hz 3kHz
Signal to noise ratio at 10 mV 35 dB

Amplifier

/ Pioneer SA 540
Total harmonic distortion 0.02%
Intermodulation distortion 0.008%
Damping factor 90
Frequency response ± 0.2dB 10Hz - 60kHz
MM phono input sensitivity 2.5 mV (max 250 mV)
Phono MC input sensitivity 0.2 - 0.1 mV
Sensitivity of line inputs 150 mV
MC phono signal to noise ratio 75 dB
MM phono signal noise ratio 92 dB
Line noise signal ratio 105 dB
Bass tone control ± 9 dB at 100 Hz
Treble control ± 9 dB at 10 kHz