Too much hum, any thoughts?

[C-Grin]

Hey Gurus I know it's impossible to answer this but I was just wondering about directions to think about. I am not going to put my hands in it as I am not capable. The amp is an East club 18 and is awesome But it is starting to hum pretty loud and it is in the power section as I have isloated the pre amp side with a noise gate. It gets proportionally louder as the volume goes up. The rectifier went out a while back and blew the fuse, I replaced it also swapped all the pre amp and power tubes. Swapped the rectifier again. Tried a different power supply cord. No change in hum. I thought maybe the filter caps as they are from 2012 but no visable signs. Thoughts?

 

[syscokid]

It could very well be a filter cap issue. The IC brand of electrolytic capacitors have a crappy reputation in guitar amps. Time to take it to a competent tech with proper testing equipment.

 

[fitz]

Have you tried to measure the hum frequency?
Phone apps will get you a ballpark result.

Is the hum consistent if the amp is plugged into different circuits around the house?

 

[C-Grin]

It could very well be a filter cap issue. The IC brand of electrolytic capacitors have a crappy reputation in guitar amps. Time to take it to a competent tech with proper testing equipment.

It is going to my fave amp guy, I mainly opened it up for the date on the inside and to see if anything obvious was going on.

 

[C-Grin]

Have you tried to measure the hum frequency?
Phone apps will get you a ballpark result.

Is the hum consistent if the amp is plugged into different circuits around the house?

I did not try that but I have amps in a few spots and nothing wierd going on with any thing else. I am waiting for my "guy" to get back to me. He is kind of crazy scientist amp nerd that is terrible about returning calls. but worth the wait.