AC30 C2 hum
I have an ac30 c2 from a guy from my town , he asked if i could repair it ,the master volume pot wasn't working I replace it with a 500kohm type A pot from a guitar does it matter if it was a guitar part? i mean the value its the same that the original from the ac30 c2 had, I just had to adapt the legs so they could fit , Also the amp was dropping the volume and cracking a lot i just changed the 4 el84 tubes and it appears the problem was gone but apparently now it has a hum like a 60 hz or 120 hz i noticed it but it thought it was normal until the owner told me that wasn't sounding before, what could that be so when he brings the amp back i could look into , the amp is from 2017 so im not sure if its the capacytors because its not an old amp, but im not sure, it im not a tech or anything just getting started on repairing things like that i live in juarez mexico so there are not a lot of honest or trusthworthy tech people for that kind of job , and if there are they take a lot of time to repair things , anyways very happy for this community , i hope someone can give insight or helpful info , sorry for the bad english
Put the old tubes back in and see if the hum stops