03-27-2020, 11:14 PM
Fellow Phorum members, thanks for all the input so far.
To answer some questions. Yes, C49 and C51 were replaced. I know about the missing tie point on the schematic.
I can say that I went over all connections in the power supply circuit to make sure all connections were correct and had good connections.
I have restored a lot of vintage radios, Philco and others, and have never had this level of hum with all necessary components replaced.
As I stated, I could add extra capacitance to the circuit which practically eliminate the hum, but it bothers me why it cannot function properly with the 8uf as designed.
To answer some questions. Yes, C49 and C51 were replaced. I know about the missing tie point on the schematic.
I can say that I went over all connections in the power supply circuit to make sure all connections were correct and had good connections.
I have restored a lot of vintage radios, Philco and others, and have never had this level of hum with all necessary components replaced.
As I stated, I could add extra capacitance to the circuit which practically eliminate the hum, but it bothers me why it cannot function properly with the 8uf as designed.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
