M VariMu slight channel difference - Gearspace.com
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M VariMu slight channel difference
Old 16th November 2009
Gear Maniac
🎧 10 years
M VariMu slight channel difference

This is more out for curiosity sake, but I was measuring the Manley VariMu I'm using and I'm seeing a peak at 60Hz (and it differs in level between the channels.) The peak on the left channel is +10db higher than the one on the right channel and far stabler(which has a subtle peak and then drops to some broadband noise 10db below that signal.) Could there be an issue cropping up or a way to get rid of it? I've checked my signal chain and it's definitely being generated by the gear and not converters/cables/patchbay. I haven't gone through and started swapping tubes but might if I have some time just to figure out what's creating it. (BTW, I do realize that 60Hz must mean it's a mains hum in the US, I'm more curious about the difference between channels)

The reason why this is really just curiosity is because the level of this peak is -100 dbFS (Left) verses -110 dbFS (Right) so it's not affecting any work.
Old 17th November 2009
Lives for gear
🎧 15 years
The channel might also be closer to the power transformer, there could be a (slight) difference in grounding or a local filtering cap could be a little off.

You'd have to look inside and experiment. The questions is, of course, if it's worth it, but I know how these deviations can be annoying. ;-)
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