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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 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
988 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.  
dave_b's avatar
dave_b
3,159 posts
 
Get a Vanguard and be done for life...saw Hifi Heaven is selling them for $3495!!  Unbeatable at almost any price.
hmavunduk OP
4 posts
 
I just found that 'preamp out' jacks of the amp shows short circuit when I check them with a multimeter. Is that normal? If not what would be wrong?  

(I actually took out preamp section before checking)
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