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Monoblock disadvantage or...?

My friend has QuickSilver M60 tube monos(2 x 12au7 input and 4 x EL34 out tubes).
When I bring my ear to each of the speakers one speaker has bigger hum of 60Hz than the other.
The hum though isn't audiable from the listenable distance.
I've hooked them up with different sets of interconnects but the hum difference was still present.
What I might want to check and how?
128x128marakanetz

Showing 1 response by marakanetz

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marakanetz OP
5,473 posts
 
...I actually checked it problem(pardon to forgot to mention) with all sources+preamp off. Since it's audiable only when I bring ear close to the speaker driver, I will not worry too much although will experiment with cheater plugs arround.
Thanks!
Mara.
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