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Thanks for you response. I am out of my house right now, but I read in a mesa boogie file that it is possible change of tone And weakness when you have the effect loop active without anything connected. I tested that quickly And sounds better but I must check slowly everything when arrive to my...

A few minutes ago I was playing. I changed the transformer by one of 1000 W... I cleaned the contacts of all tubes in the afternoon too. But, the problem is the same... channel 1 es very clean but if you play hard has a little hum, but the channel 2 and 3 is muddy, with a lack of gain, I mean...

Sorry for the double-posting but I am new here and I need help! Dear Srs. A few days ago, finally my MB Mark V arrived to my home (Chile). I bought this amp from ebay one month ago. A friend of mine bring it to me personally, but he doesn't put out the tubes from the amp when he returns to...

Dear Srs. A few days ago, finally my MB Mark V arrived to my home (Chile). I bought this amp from ebay one month ago. A friend of mine bring it to me personally, but he doesn't put out the tubes from the amp when he returns to Chile. Here, I bought a 500 W step-down transformer and connected...