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Hissing sound when Tone Control is turned on

Hello all,

Wonder if any one of you experienced the same issue with your Mcintosh preamp ? If you did and what was the solution to it?
I have noticed that apparently audible hissing sound can be heard from my speakers during idle while the "tone control" is enabled on my Mcintosh C49 preamp. As soon as i toggled the tone contol switch off from the front panel the hissing sound is completely gone and the background is dead silent like it supposed to. 

Is this considered normal ? Any advises will be appreciated.

Thanks

Larry

larrymanadgn
Post removed 
noromance's avatar
noromance
9,769 posts
 
Make sure the Treble tone setting is not set too high.
larrymanadgn OP
9 posts
 
Hi guys,

Thanks for your replies. The hissing tone remained the same level even when the preamp was set at zero volume. No other tone controls or EQ were in the chains. I have tried unplugging each sources one by one made no differences. And i have also tuned down the treble or made no gains from the power amp, the result was the same. But as soon as the tone control button is turned off on the front panel the hissing goes away completely. That was why i was wondering if this is considered normal for Mcintosh preamp’s. Thanks


oldhvymec
5,101 posts
 
None of mine, to date.

Regards.
larrymanadgn OP
9 posts
 
Hi oldhvymec,

May i ask which Mcintosh preamp you are using ? This preamp performs very nicely and i love it. But this is my 1st time using Mcintosh product and i have no friends using some brand so i can compare with. Maybe i bought a slightly defective unit or perhaps it is normal. I have tried to ask Mcintosh technical support by email but not heard back from them yet. I will just wait and see how they reply to me.

Thanks
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