2. speakers
  3. 161175-121754

Can someone tell me what wrong

Hi there
i need some held with speaker hissing noise
i recently noticed some noise come from my right speaker 
the speaker is venture audio grand mk3 and driven by vta m125 tube mono block, it’s kind of loud, i can hear it from 4 feet away the speaker with the preamp turn off, it doesn’t effect by the preamp volume 
so here is what i did
Remove the preamp - still the same noise
swap the mono block - still the same noise
swap the speaker cable between left and right - still the same noise
hook up a vintage dynaco st70 - no more noise
hook up the right channel mono block to the left speaker - no noise 
so what could be wrong here?
I didn’t have that noise before 
This thing really drive me nut
Thank in advance 
 

128x128ownut
noromance's avatar
noromance
9,821 posts
 
As always, make sure no modems or routers are nearby. 
arnoldo
26 posts
 
I had a similar problem with my tube amp.  After giving manufacturer a hard time about it turned out my outlet wasn't grounded and way amp was designed the ground is important.  Wasn't a problem with previous amp because it was vintage and two prong plug.  Ran a ground wire directly to fuse block and solved problem.  Can get one of those $5 outlet testers to check and see what manufacturer says about it.
ownut's avatar
ownut OP
9 posts
 
After swap the power tube the problem still there so i swap the 2 driver tube and still the same
i then looking at the power circuit, find out that its the same circuit which i recently move the wifi router 
Unplugged it then the noise is gone
A very stupid mistake 
thank for helping me out with this

mbw's avatar
mbw
12 posts
 
Way to go noromance! I’ve got an Ethernet switch in my system. Though I’ve not noticed any problems, how do I know? It’s always been there. Will a switch potentially cause cause the same problem as described above? 
noromance's avatar
noromance
9,821 posts
 
@mbw Any electronic device can mess up the sound. In this case, it was a wi-fi transmitter which is as bad as it gets! Listen with your switch on and off. Any difference? That's your answer.
More to discover