Rectifier Issue pop and tone/vol drop

[dbiddle138]

Hey all,

I am a long time MKII user but recently bought a multi watt dual rectifier used. After about 10-13 minutes of being on, there’s a pop and then the volume dips and the sound gets changes (certain frequencies vanish).

I’ve installed all new tubes and that didn’t help. I wrote Mesa and they said it’s not a tube issue and that I’ll need to see a tech. All well and fine except the closest Mesa tech is four hours away.

So, I guess I’m curious if anyone has a guess as to what’s happening with the amp so I can plan on how much the repair might cost. I am guessing a capacitor but I am no tech!

Thanks in advance for your collective wisdoms.

 

[user.39921]

It can be all sorts of things. Go to the tech.

 

[daveyf]

The rectifier tubes need to be checked again. I had a similar issue with my T verb combo, the rectifier tube made a popping noise and then the sound was very distorted. I would check/replace the rectifier tubes to start.