Audio Note Kits Forum

Sorted - but logic fails

212.32.96.26

In Reply to: RE: Monoblock Microphony posted by richardcooper2k on January 17, 2008 at 13:13:20

replacing both 6SH7's did the trick no more microphony. but this is where it gets weird - i previously swapped all ht ps components (everything on & including white stand offs) as complete units between lh & rh mono which moved the microphony problem from lh to rh mono. simple - had to be a problem with one of the ht components - wrong !!. to find out which component was responsible i then moved each component back separately from rh to lh mono one at a time testing for microphony after each move (painstaking !!). even after all components were moved back to the lh mono the microphony problem stayed with the rh mono. so i ended up with the problem moved but not the components. i was not going to post this - maybe its time to see my shrink ? can only think that the 6SH7's were working on the limit but plate voltage only 186 -190 so should not be a problem.

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