Hoping that someone can steer me in the correct direction. I have a Brazilian style amp that arrived with just about every semiconductor bad. They all fell off the PCB, when removing the PCB.
A few of the semiconductors are defective, the. Dual diodes have failed, marked u1640s1 and u1640s2 . Based on measuring the good ones, there are common anode and common cathode. I found a U1660 aka (common cathode) but no luck finding the common Anode.
The u1640 appears to be a 400volt device, and I have installed the 1620 (200 volt) as a test . All is functional with the 200 volt installed.
Any suggestions? Keeping the TO220 case?
A few of the semiconductors are defective, the. Dual diodes have failed, marked u1640s1 and u1640s2 . Based on measuring the good ones, there are common anode and common cathode. I found a U1660 aka (common cathode) but no luck finding the common Anode.
The u1640 appears to be a 400volt device, and I have installed the 1620 (200 volt) as a test . All is functional with the 200 volt installed.
Any suggestions? Keeping the TO220 case?