Hissing sound when Tone Control is turned on

I bought a 1.5 year old pre-owned C49 preamp from my Mcintosh dealer. So i had no idea about how this preamp functioned when new. That was why i was hoping to get some guides from Mcintosh users first.

After some time-consuming tweaks on settings of preamp and power amp, I was finally able to track down the problem, The hissing sound during idle can no longer be audible if the output gain on my Parasound A21+ power amp is set to appropriate matching level. I had to turn the gain level down to almost minimum to get rid of the hissing when Tone Control is enabled on my Mcintosh C49 preamp (of course turning off the Tone control is another less preferred option). My previous setup was pairing my Parasound A21+ power amp with Parasound P6 preamp and Parasound official recommended the output power gain for both channels to be set to maximum all the times. And the parasound P6 and A21+ combo were working beautifully as well. I guess i should have done this equipment output matching practice before i raised my concern, especially when i pair the Pre & Power amps designed and manufactured by different brands. I am still new to hi-fi world so i learned an important lesson today.

Thank you for your valuable inputs anyway.

Happy Music Listening !

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

Overall i have to patiently tweak and find the best matching gain levels between my MAC C49 preamp and Parasound A21+ amp.

Here is a thread found in AVS Forum, members were also discussing the similar topic : https://www.avsforum.com/threads/parasound-owners-thread.1122095/page-332

Get gear without tone control... apart from L/R balance you should not need any

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