Problem with new Blackstar amp.

[droptune]

I just bought a Blackstar HT5 metal head and a 1-10 cab. The amp is doing a strange thing. On the distortion channel the low notes sound really buzzy and fuzzy. I almost hear a static electricity kind of thing. The low E string in the lower registers is where is occurs. I plugged it into another cab and same thing. It is doing it with all my guitars too. I wish I could give you a better description of the sound but that is the best I can do. Hopefully someone can help.

 

[rastaman]

Change the tubes.

 

[vbf]

How do you have the EQ set?

 

[droptune]

Everything on the eq is set midway.

 

[ksandvik]

Tubes, maybe pre-amp ones, especially if the high ones sound good and some frequencies bad. Power supply tubes bad, everything sounds bad.

 

[rastaman]

Always change the tubes first, trust me.

 

[DaveKS]

It may just be a tube socket is loose or a tube not seated properly. When tube pin is not making good contact you can get that type of buzz. It will arc across to pin creating a almost transistor clipping type sound.

Deoxit vacuum tube survival kit is good stuff.