C The radio works unreliably
1 The radio crackles and/or is intermittent
a. Follow the directions mentioned in A-1
b. Check if the antenna-ground connectors
making good contact
c. Check if the symptom can be resolved by
replacing tubes in sequence
Block diagram
B2 Mixer
B3 IF amplifier B4 detector
B6-B7 Audio
LW MW SW
LW MW SW
Amplifier
B1 FM unit
B2 IF amplifier
B3 IF amplifier
B4 IF amplifier
B5 detector
B6-B8 Audio
FM
FM
FM
FM
Amplifier
B9 Power
B10 Tuning
Supply
indicator
Special thanks are due to Jef Collin for this translation
