Mark III strange noise

[Aaroncbr]

I did a search but never came across anything for this situation.

When i play clean there is a distortion noise in the background. and if you listen carefully it's in the lead channel too.
It started pretty quiet but it's getting louder.
I only just picked it up from the repair shop too.

Could i just need to replace the pre amp valves or could it be something more serious?

If it helps it's a 100/60 blue stripe combo.

It's just seems to be problem after problem with this amp... I might go back to my plexi...

Thanks!

 

[>Photi G<]

Does the amp have reverb? If so, the reverb transformer may be cooked.

 

[Aaroncbr]

It does but I don't have the reverb tank. I bought new pre amp tubes and they fixed it.