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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

Showing 5 responses by oldhvymec

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

Regards.
oldhvymec
5,101 posts
 
C11, C20s, C2500, Mx110z, Mx120.  A few.. When they are tuned up and running they are quiet..

Did you buy it new? Did it just start making noise or out of the box. it made noise?

They make music, not noise..:-) This summer 50 years with Mac.. YUP I'm a Mac guy.. I like their older valve gear.. MC225, 240, 275, 30 and 60s. I don't currently own ANY SS Mac Power amps.. Just valve.. I have a Cary V12R I really like with a Mac front end... Just perfect for me.

I use class Ds to do all the bass duty.. Actually I'll be swapping over within a month or so.. See how the weather act.. Class D, for the main monitors in the summer too. Valves are just to hot.. It gets to be 110 + here where I live..

Regards
oldhvymec
5,101 posts
 
Juicy good my friend, you found an answer.. Parasound, that is another under appreciated amp.. I have a ZPre3 I use with a C20 to add a remote control and all the goodies of an OK DAC via a tape loop.. Just needed to do a little matching.. Even added a sub out option, still sounds like my C20 100%, serious little preamp.. GREAT phono stage MM MI and an MC with 56 db of gain.. (52?) It has a wonderful bass contour for the phono/tape section.. attenuated bass step baffle. 

I hate noise.. LOL 

Regards
oldhvymec
5,101 posts
 
Yup...
oldhvymec
5,101 posts
 
Crack me up.. Of course there is a reason for tone control. That's why the OP opted to have it just like me for the last 50+ years.. You don't need it until you do.. LOL One a month or so always ask "I need a bass boost, or they are a little boomy on certain albums"  It really doesn't matter.. When you need it.. You need it.

AND no I don't want to know what it sounds like live.. That's usually REAL bad... so... Tone control...  You get in your car you don't adjust the tone control? BS yes you do and or you did or it auto sets the tones to some preset EQ.... No Tone Control is just a CHEAP way to make a piece of distribution equipment, nothing more.. Not because it sounds better. The purpose of a preamp is to color the sound...

I don't care what anyone else thinks, that is what they use to be made for and what I still use them for.  Somethings just never change..

Regards
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