Ampeg BA115 very loud humming sound

[evil79]

I've got an ampeg ba115, and i just replaced the power transistors and everything worked fine for a few weeks, and now when i turn it on, there is a very...

[CA_Dan]

What are the top culprets assuming 60Hz hum and power supply caps are ruled out? I have an amp that definetly has 120Hz hum that doesn't change with volume...