Hi everyone!
I have a renovation Project going on on my Onkyo 8150 linear PSU from around 1990+.
This cracking noise comes whit heavy bas around 50-100hz
The speakers i use is KEF 103/3.
These speaker works fine on my NAD 310.
Now im pretty new att fault searching analog tech.
Ive look through the basics:
-look for burned components
-try solder joints
All i can see is that the PCB have been a bit hot at the driver transistors.
Someone before me have soldered a 0.56pF cemaric kapacitor between the Emitter and Base probably because of this problem (same transistor that have heat development at the PCB.
I wish to know why 🙂
A Newbie like me are Thankful for all input and advice🙂
If you need more pictures ill post them.
Even got the schematic for the amplifier
I have a renovation Project going on on my Onkyo 8150 linear PSU from around 1990+.
This cracking noise comes whit heavy bas around 50-100hz
The speakers i use is KEF 103/3.
These speaker works fine on my NAD 310.
Now im pretty new att fault searching analog tech.
Ive look through the basics:
-look for burned components
-try solder joints
- Thermal camera to see if specific components goes to hot compared to the data sheets.
- check for suspicious caps
All i can see is that the PCB have been a bit hot at the driver transistors.
Someone before me have soldered a 0.56pF cemaric kapacitor between the Emitter and Base probably because of this problem (same transistor that have heat development at the PCB.
I wish to know why 🙂
A Newbie like me are Thankful for all input and advice🙂
If you need more pictures ill post them.
Even got the schematic for the amplifier
