Help! problems with aleph30

[same]

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?

[Zen Mod]

Originally posted by same
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

[same]

Originally posted by Zen Mod



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

[Zen Mod]

Originally posted by same


Is a monoblock (the other channel have her PSU) but not seem PSU noise

check wiring , then check what I wrote in previous post

[same]

hi,
I have clean the PCB and now the problem seems resolved. Maybe the cause was a very little track of soldering paste.
For some days ampli will be under control.....