So, finally, after > 6 months, I finalised my 2nd Aleph 2 monobloc (will post some pictures later).
I fired them up last Sunday, and they sound so great!! (I'm not so good in hifi-magazine like superlatives, but I agree on everything that has been written on this forum about the sound of Aleph's) 😉
But... after they were playing some time I noticed that one of the monoblocs gets hotter than the other one. The largest difference is measured at the current source transistors: warm heatsink (you can leave your hand on for a long while) for one monobloc vs. hot heatsink (you would want to retrieve your hand after a couple of seconds, but not so hot that you would burn your hand) for the other one. I also noticed that the hottest monobloc draws appr. 1.7A from the power line, while the cooler one draws appr. 1.5A (both at appr. 230V).
I cannot really say that I hear a difference between both channels. I am now wondering what could cause this difference. And if something is wrong, should I than suspect the hot or the cool one? And where should I search the problem, if any?
Thx in advance for answering!
I fired them up last Sunday, and they sound so great!! (I'm not so good in hifi-magazine like superlatives, but I agree on everything that has been written on this forum about the sound of Aleph's) 😉
But... after they were playing some time I noticed that one of the monoblocs gets hotter than the other one. The largest difference is measured at the current source transistors: warm heatsink (you can leave your hand on for a long while) for one monobloc vs. hot heatsink (you would want to retrieve your hand after a couple of seconds, but not so hot that you would burn your hand) for the other one. I also noticed that the hottest monobloc draws appr. 1.7A from the power line, while the cooler one draws appr. 1.5A (both at appr. 230V).
I cannot really say that I hear a difference between both channels. I am now wondering what could cause this difference. And if something is wrong, should I than suspect the hot or the cool one? And where should I search the problem, if any?
Thx in advance for answering!
I suggest that you measure the DC drop across the Source
resistors of each output device. They should be be consistent.
resistors of each output device. They should be be consistent.
Hello Mr. Pass
It is incredibly encouraging for me to be advised personally by you!
I did as you told me, and measured the dc voltage across the source resistors.
I fist measured the gain devices, and voltages were all in the 0.37-0.38V range.
Then I measured the constant current devices, they showed voltages in the range of 0.45-0.46V, except the fift device: 0V!!
I removed the PCB from the heat sink, and guess what: I found one bad solder joint! I've repaired it, and now voltages over the source resistors of the gain devices are in the 0.47-0.48V range. Problem solved!
Thank you for sharing your IP rights with the DIY community!
Greetings from Belgium
It is incredibly encouraging for me to be advised personally by you!
I did as you told me, and measured the dc voltage across the source resistors.
I fist measured the gain devices, and voltages were all in the 0.37-0.38V range.
Then I measured the constant current devices, they showed voltages in the range of 0.45-0.46V, except the fift device: 0V!!
I removed the PCB from the heat sink, and guess what: I found one bad solder joint! I've repaired it, and now voltages over the source resistors of the gain devices are in the 0.47-0.48V range. Problem solved!
Thank you for sharing your IP rights with the DIY community!
Greetings from Belgium
- Status
- Not open for further replies.