Help! problems with aleph30

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Hi!
I have build two A30 monoblocks with the Peter Daniel's PCB. In the first month they works fine.
Yesterday I heard in one speaker a strange random noise, sometimes low, sometimes high, sometimes nothing.
Anyway the amplifier works but with this strange noise.
What can be happen?
 
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same said:
Hi!
I have build two A30 monoblocks with the Peter Daniel's PCB. In the first month they works fine.
Yesterday I heard in one speaker a strange random noise, sometimes low, sometimes high, sometimes nothing.
Anyway the amplifier works but with this strange noise.
What can be happen?


exact schematic is ?

besides inspection of all solder joints , check all elkos ,especially ones in feedback and Aleph CCS modulation

if not that - replace both input mosfets , or first just mosfet for input CCS
all that counting that you have common supply for both channels , so - because you hear noises in just one channel- PSU is excluded
 
Re: Re: Help! problems with aleph30

Zen Mod said:



exact schematic is ?

besides inspection of all solder joints , check all elkos ,especially ones in feedback and Aleph CCS modulation

if not that - replace both input mosfets , or first just mosfet for input CCS
all that counting that you have common supply for both channels , so - because you hear noises in just one channel- PSU is excluded

Is a monoblock (the other channel have her PSU) but not seem PSU noise
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.