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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
ownut's avatar
ownut OP
9 posts
 
@tomcarr i will try to swap the tube later to see what happens 
twoleftears's avatar
twoleftears
5,313 posts
 
If you have swopped over each single component in turn and kept every other variable the same, and the noise never follows to the other channel one particular component, but sometimes goes away in both channels after you've made the change, then it is intermittent and, as already suggested, probably affected (temporarily cured) by the simple act of swopping something over.
tomcarr
1,468 posts
 
Let us know what fixes the problem :)
itsjustme
681 posts
 
If every test is as you say, I'm baffled. The ONLY answer is that a) its the amps and b) they both changed at the same time.  And suddenly.
This is very unlikely.
Speakers don't generate hiss.
Passive components don't generate (meaningful) hiss.

You removed the preamp.
You swapped mono amps with no impact (are you sure?)
It is coming up to Halloween and a Full Moon....
itsjustme
681 posts
 
you already swapped tubes. You swapped the entire amps!
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