BAT VK75SE buzz and humming ?? help..

So, tubes can cause this problem ?

thanks

What tubes and how old is the amp?
I assume that VK75 is not a long time in production to undergo capacitor replacements for instance. The fact is that if it "eats" tubes especially one earlier than others than definitely something is wrong.
You may want to check bias if possible. Tube oscilates when it doesn't have negative-enough grid voltage. Check an output tube manual for allowed negative voltage tolerance or call Viktor to find out and measure between the ground binding post and pin#5 with amp on and no tubes using voltmeter set to measure low-hundreds of volts.

Marakanetz, thanks... have no idea what you said.. but I presume I need to test the tubes out one way or another ..

I may have a guy locally that can do this..

The unit is not old, I would say within 2-3 yr.. the TUBES, well the box that they were wrapped in said "CCCP" need I say more..

thanks
Matt

Are you using XLR adapters on the inputs? There have been incidences where the adapters are the cause of the hum. Try using a pair of balanced interconnects, See if that helps.

you didn't buy the wrong amp...that's one of the best. somethings up...bad tube, bad component...ground loop...