AMPEG SVT II PRO humming buzz sound?!?

[thgr8manzyuk]

hey guys i just bought a SVT 2 pro (1990's) and it sounds amamzing. i run it through my ampeg 610's as well as through the main. the amp is in a road case that include a cooling fan, korg tuner and a furman power conditioner. but the problem is that there is a loud buzzing sound that comes out of the main speakers from my bass channel. it doesnt come out of the speakers, only the house. any ideas as to what the problem is? oh and i have tried turning off all of the idividual compenents in the road case an no luck.

 

[JimmyM]

not sure, but sounds like maybe a ground in the xlr out got loose or damaged.

 

[B-string]

Does the "SVT" 2 pro have a ground lift switch on the DI? Could also have a bad XLR cable going to the board.

 

[Jefenator]

Even without any symptoms, I'd recommend taking it to a tech for a checkup. The thing is about 20 years old, now - it's time. And that head deserves the TLC.

I just took my SVT II -P (preamp version of your head) in for service. One input jack was bad (which was inconveniently causing a loud hum when nothing was plugged in). He fixed that and touched up a bunch of cold solder joints, all for about $60.

 

[jjmf]

Im having a bad hum / buzz on my recently bought used svt 2 pro as well - just posted here:
Ampeg svt 2 pro problem

any insight is appreciated

 

[jjmf]

Bump for any thoughts on what to check?

 

[JimmyM]

Could be anything from a loose ground to a bad tube or cap or corrosion in the preamp and power amp in jacks. Best thing to do when you get an amp new to you with a problem is to get it checked out by a tech.