Hi Charles1dad,
Following that Lamm suggestion, about ten days ago I dropped the unit to the dealer for observation and necesary repair by their technician.
Amazingly, what they did and feed back me after having their own observation are as follows:
1). There is no repair or parts replacement required to the Lamm. They said this is new unit and no need any repair, only small tightening by reinforcing some solder has been made in and to the power supply area (I am not sure whether this is necessary)
2). The DC Offset fluctuation on the preamp that caused by AC voltage swing is naturally common in Lamm as this is the natural design of Lamm. In other words, the Lamm design will allow such AC swing, even as small as 0.3-0.5v AC, and pass it through the circuitry, to generates high DC milliVolt.
3). They suggesting me to use another power amp that may compatible with the Lamm. They also suggesting me to use stabilizer.
Learning from the above:
1)Should I push the dealer and technician to change the capacitors while they are very confidence that there is nothing wrong with the unit?
2) To my understanding, installing stabilizer and using other power amp is not the right way in solving the root of the problem, it's only curing the symptom while the real problem still exist, beneath. This only creating a time bomb.
I urged the dealer to contact Lamm about this, but they asked me to bring back the unit isntead. They very confidence the unit will be just fine. I can imagine, once the unit back to my system the problem will still exist, and do know what should be the next thing to do except to sell it
Following that Lamm suggestion, about ten days ago I dropped the unit to the dealer for observation and necesary repair by their technician.
Amazingly, what they did and feed back me after having their own observation are as follows:
1). There is no repair or parts replacement required to the Lamm. They said this is new unit and no need any repair, only small tightening by reinforcing some solder has been made in and to the power supply area (I am not sure whether this is necessary)
2). The DC Offset fluctuation on the preamp that caused by AC voltage swing is naturally common in Lamm as this is the natural design of Lamm. In other words, the Lamm design will allow such AC swing, even as small as 0.3-0.5v AC, and pass it through the circuitry, to generates high DC milliVolt.
3). They suggesting me to use another power amp that may compatible with the Lamm. They also suggesting me to use stabilizer.
Learning from the above:
1)Should I push the dealer and technician to change the capacitors while they are very confidence that there is nothing wrong with the unit?
2) To my understanding, installing stabilizer and using other power amp is not the right way in solving the root of the problem, it's only curing the symptom while the real problem still exist, beneath. This only creating a time bomb.
I urged the dealer to contact Lamm about this, but they asked me to bring back the unit isntead. They very confidence the unit will be just fine. I can imagine, once the unit back to my system the problem will still exist, and do know what should be the next thing to do except to sell it