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Krell KAV 300i Problem

Hi, everyone,

My beautiful Krell KAV300i has started to show some issue recently that I hope somebody here can address the problem. Well, I can explain the problem as follows;

1- Amp is on, nothing connected to the input jacks, when I get closer my hands or touch one of the input RCA jacks a very high, annoying hum starts,

2- Amp is on and I play and listen to something thru one of the single ended inputs without having a problem. But when I switch to an empty input channel annoying hum starts again.

This probably happens to be a grounding problem and just have occurred very recently. Something has failed inside the amp but what would it be? I have been using another system using the same AC outlet having no problem at all. I also tried this amp in another room but the problem was still there.

I’d like to have comments on this.
Thanks.
hmavunduk
hmavunduk OP
4 posts
 
Thanks, I'll try this.
Malik
gdhal's avatar
gdhal
1,641 posts
 
Malik, while it certainly can be a true problem, Al may be entirely correct about it not being abnormal. One thing though that could help differentiate between normal/abnormal and that you have not indicated... at what volume level does the hum occur? If the gain is substantial you certainly can hear a hum through unused (open and not connected to any load) RCA inputs if you switch the amp to that input. On the other hand, if the gain is all the way down this would not be normal. Just my .02
hmavunduk OP
4 posts
 
Thanks for your comment. Hum occurs in normal listening volume level. There might be substantial amount of hum in preamp but the weird thing is that I have not heard that much amount of hum before. Lastly I tried to drive the amp with my dac-headphone amp combo (ifi nano) it was enough to touch the dac for the hum suddenly appears and drove me crazy.
dave_b's avatar
dave_b
3,159 posts
 
It's broke...get it fixed or replace it with a used 400Xi.  
jon2020's avatar
jon2020
986 posts
 
I agree it's broken and it needs to be fixed. The hum as you describe is not normal. I used to own the KAV 300i for several years and not once did it have any hum.  
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