Ampeg 4pro tube problem?

[krfoss]

Hey there,

I have an ampeg 4 pro head with 410hlf cab. It is making this TERRIBLE crackling, staticy noise when I am playing at higher volumes. Could it be a tube problem? A speaker problem? I bought the cab new about 9 months ago and have not played it too loud. The head was purchased at the same time, but B-stock (demo unit) from Ampeg.

So, which sounds like the culprit?

Also, rather than dropping the money on new tubes, could I clean them to make them not sound like ass?

Lastly, does anyone have a tube replacement suggestion? i.e. Ampeg says the first 12ax7 is a Groove Tube, but which are the other two, and what do you reccomend.

THANKS!

 

[JustRob]

More info needed...Is the head on top of the cabinet? If you separate the head from the cabinet, does the noise stop? Could be vibrating a bad connection, microphonic tube, bad jack, bad cable, etc....
Are you possibly hearing the amp clipping through the horn in the cabinet?

 

[Jerrold Tiers]

Are you possibly hearing the amp clipping through the horn in the cabinet?

+1


Turn down the horn and what happens?