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Acceptable level of hum at max volume?

so i am noticing a faint hum when i set my amp to full volume. not sure if it's been there all along but i was tinkering around and noticed it. here is my setup: rega p3-24 w/ttpsu and herbie mat into jolida jd 9 into decware mini torii. if i switch the mini torii to the second input via the switch i get no hum, but when i switch back to the phono i can hear it. mind you this is at FULL VOLUME. my question is, is there an acceptable level of hum at these outrageous volumes. it's not present in the music at normal or even loud listening levels it's just something i noticed while dickering around. i've tried all the usual solutions to eliminating hum like cheater plugs and moving components and swapping cables. i even have a line conditioner. what say you enthusiasts?
roggae
mofimadness's avatar
mofimadness
5,117 posts
 
Since your int. amp and phono stage are both tube based, IMHO, you're not hearing anything out of the ordinary.

My system has a tube preamp and a couple of different tube phono stages. It also has some hiss, (tube rush) if the volume is turned all the way up. Probably more than you are hearing. Never been a concern.
pbnaudio's avatar
pbnaudio
1,614 posts
 
A Phono Preamp has a LARGE amount of gain - some hum will almost always be present - if you cannot hear it at your listening position between tracks at normal to loud listening level - don't worry about it.

As Always - Good Listening

Peter
stringreen's avatar
stringreen
6,490 posts
 
It shouldn't hum at all....you may hear a hissssss with full gain, but not a hum
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