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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 
 

ownut

Showing 2 responses by twoleftears

twoleftears's avatar
twoleftears
5,320 posts
 
I think we can help you, by the process of elimination you describe, but your description of each change you make needs to be clearer and more specific.

For instance, what's the difference between swopping the monoblocks and hooking them up to opposing speakers?

In each instance we need to know what is hooked up where, and if there is any noise from either speaker.

For instance, when you hooked right mono to left speaker, did you also hook left mono to right speaker?  Was there noise is either channel?  Which speaker cable did you use?
twoleftears's avatar
twoleftears
5,320 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.
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