Hi!
I'm trying to find out what is wrong with this amplifier. It works fine for some 15minutes, then I can randomly hear some sharp "pops" from right channel. This popping sound is getting louder and louder and finally right channel gets hot and there is lots of DC at output. It burned one of my test speakers. I resoldered the amp board and changed 4 zener diodes (16volts and 39volts). Did not cure the problem - and now im using dc blocking caps at output to prevent any speaker damages.
Anyone familiar with Levinsons and such a problems?
Best regards.
I'm trying to find out what is wrong with this amplifier. It works fine for some 15minutes, then I can randomly hear some sharp "pops" from right channel. This popping sound is getting louder and louder and finally right channel gets hot and there is lots of DC at output. It burned one of my test speakers. I resoldered the amp board and changed 4 zener diodes (16volts and 39volts). Did not cure the problem - and now im using dc blocking caps at output to prevent any speaker damages.
Anyone familiar with Levinsons and such a problems?
Best regards.
What is the value of the red dot voltage when measuring standby?
Is it correct to measure the blue dot resistance value?
Is it bad to measure the purple point 2N5551?
LJYS,
I am having a similar issue with a Mark Levinson 436.
Could you please send me a private message so I can explain the issue and see if you might have any suggestions?
Thank you.
I am having a similar issue with a Mark Levinson 436.
Could you please send me a private message so I can explain the issue and see if you might have any suggestions?
Thank you.
Hello:
Please measure TP10 and TP11, what is the voltage in standby?
What is the voltage of TP13 in standby?
Please measure TP10 and TP11, what is the voltage in standby?
What is the voltage of TP13 in standby?
Hi LJYS,
Could you please drop me a private message?
I would like to seek your advice.
Thank you so much.
Could you please drop me a private message?
I would like to seek your advice.
Thank you so much.
@Catcherkun Please set your translation to English. You are posting in Chinese, this is an English language forum.
Please help me, I have a 432 post-stage, I need to change the voltage from 120V to 230V, can you provide information, thank you very much
Q112, the 2N5401 is most likely the one causing the pops. In a later stage it was replaced by ML by a MPSA56 which is even worse.
When popping comes back, you better replace it with a ZTX796A.
Hans
Hello all, I just got myself into something I might regret )
bought a 432 with random popping noises during operation.
What would you say - can a mere diyer fix this, or it's only Audio Gods can handle such equipment? 😀
Also is there a consensus about the most probable reason for this behavior?
Some say it's transistors in the current stabilization scheme of vas.
Some report power supply starts to oscillate when (small) capacitors going south.
Some say you have to replace main filter caps.
I don't have the amp in my hands yet, just starting to research preemptively.
Any suggestions are much appreciated!
bought a 432 with random popping noises during operation.
What would you say - can a mere diyer fix this, or it's only Audio Gods can handle such equipment? 😀
Also is there a consensus about the most probable reason for this behavior?
Some say it's transistors in the current stabilization scheme of vas.
Some report power supply starts to oscillate when (small) capacitors going south.
Some say you have to replace main filter caps.
I don't have the amp in my hands yet, just starting to research preemptively.
Any suggestions are much appreciated!
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