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BAT VK75SE buzz and humming ?? help..

Hello all, received a BAT VK-75SE which by the way is a lovely Tube amp for those that are not aware.

Unfortunatly I have plugged it in and have had a constant buzz since day one.. the buzzing remains even when Interconnects are removed and ground is lifted

I have :

1. Plugged the amp in a different part of the house- No Change

2. Changed Speakers and speaker cable - No Change
3. Changed PowerCord and Lifted ground - No Change

The amp itself is dead quiet, no transformer hum or anything.. could tubes do this ? ..

thanks all in advance !

Matt
mzn50

Showing 3 responses by jfrech

jfrech's avatar
jfrech
1,816 posts
 
how loud is the buzz, on my 75se I have it, but much past 2-3 feet away I can't hear it....low level...

I'd call BAT...post what you find out please. Thanks
jfrech's avatar
jfrech
1,816 posts
 
you didn't buy the wrong amp...that's one of the best. somethings up...bad tube, bad component...ground loop...
jfrech's avatar
jfrech
1,816 posts
 
If a output tube fuse is blown, it will work, and it will increase the hum considerably. Also a channel should have less power-like 1/2. If one in each channel is blown, it will still have balanced sound-but with lot's of noise and basically sound like sh&%. Look at the output tubes. Are the 4 led's on and green? If one is off, then you have one output tube fuse blown. If one is red, then a problem with the auto bias circuit (more likely a bad tube). I have had some issues with bad output tubes...replace one about every 6-12 months. No big deal though.

To replace a output tube fuse, UNPLUG the amp from ac, turn it over, and you'll see the fuse holders underneath.
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