Iusnas-0009G
New Member
I am open to some help here. First of all this Receiver is the BOMB! It is contending for first place in my stable, even while having trouble in its preamp! I will post picks when it is in one piece so all can see!
All Controls/Volume have been treated with a healthy treatment of Deoxit! Preamp has been singled out ! Both CH's have distortion and crackle one CH with lower volume and consistent noise, and the other intermittent but much louder when it hits!(like thunder w/ crackle) I have been searching AK and found the same symptoms in other Receivers ! But rarely a follow up!
Coupling cap seems to be the logical culprit or perhaps a transistor in the signal path? I have been checking and cleaning for many hours,making good progress! I found a few trouble spots and repaired them . Now It is a faulty component I seek.
I have been building a bench and I am very comfortable with a soldering iron. Seems tracing the signal path with a scope is the right course? Can you measure ESR on a cap under 1uf ? Meter states 1uf- 22000uf as test range. I think they are referring to capacitance not ESR value? If not what happens most often to the small coupling caps ? Short or partial short? Any Multimeter /tricks for Testing ? Any trouble shooting ideas would be greatly appreciated! I am waiting for a copy of SM. Thank you all!
All Controls/Volume have been treated with a healthy treatment of Deoxit! Preamp has been singled out ! Both CH's have distortion and crackle one CH with lower volume and consistent noise, and the other intermittent but much louder when it hits!(like thunder w/ crackle) I have been searching AK and found the same symptoms in other Receivers ! But rarely a follow up!
Coupling cap seems to be the logical culprit or perhaps a transistor in the signal path? I have been checking and cleaning for many hours,making good progress! I found a few trouble spots and repaired them . Now It is a faulty component I seek.
I have been building a bench and I am very comfortable with a soldering iron. Seems tracing the signal path with a scope is the right course? Can you measure ESR on a cap under 1uf ? Meter states 1uf- 22000uf as test range. I think they are referring to capacitance not ESR value? If not what happens most often to the small coupling caps ? Short or partial short? Any Multimeter /tricks for Testing ? Any trouble shooting ideas would be greatly appreciated! I am waiting for a copy of SM. Thank you all!