Mesa Boogie DC3 Hi volume problems

[na3d]

Hi, I changed all my tubes, changed the speaker and checked all the caps values and everything is ok, except when I use lead channel. When I put gain at 8, master 5, outpu 5, or more, I've got a lot of speaker noise! Is this normal at high volumes at the lead channel with gain set at 8? There's no microphonics only volume noise, when I put the gain down everything is perfect.

[xtian]

Have you plugged into another cab to rule out the speaker itself?

[na3d]

The speaker is a brand new Celestion G12 Vintage 30, 8 ohm. I put it in a case with the connections on the top. Is it possible that the speaker is getting some noise because I put the connections on the upper case?

[martin manning]

By volume noise do you mean hiss? Maybe the tube you have installed in the V1 position is noisy. Try swapping it with others and see if you get any change.

[Milkmansound]

Is it possible that the speaker is getting some noise because I put the connections on the upper case?

no

[na3d]

No, it's not a hiss, it's like the noise you hear when you put the volume on max. I'll try to change the tubes on v1 with another one and let u know. Thanks anyway