Robisme
Sansui Enthusiast
I am working on a CR-2020 that has a hum. It can not be heard with the volume at 0, but increases with the volume. The hum level maxis out at about 11 o'clock on the volume.
I have replaced the regulators on the power supply board and the two 1000uf 50v caps on the cap board.
When I use a preamp there is no hum.
I can here the hum on the 25v and -25v points on the power supply.
The receiver did not work when I started, and after replacing the regulators, it came out of protection and works, with a hum.
Someone else did the SB mods, and what a job they did.(in a bad way)
Any ideas?
Rob
I have replaced the regulators on the power supply board and the two 1000uf 50v caps on the cap board.
When I use a preamp there is no hum.
I can here the hum on the 25v and -25v points on the power supply.
The receiver did not work when I started, and after replacing the regulators, it came out of protection and works, with a hum.
Someone else did the SB mods, and what a job they did.(in a bad way)
Any ideas?
Rob