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Issue with Krell KSA-250

Hello-

It's been a minute since I've been on the forums here, but I'm glad they are still around!

I am the second owner of a Krell KSA-250 amplifier. For the past 10 years it hasn't given me any problems. Then today, when I turned it on, it emitted a rather loud buzzing sound. This wasn't coming from the speakers (like a ground loop hum), this was a very startling almost "mechanical" buzz sound. The buzz does not stop until I turn the unit off.

I'm not sure where to start. I called my local audio repair store, but they don't work on Krell. They suggested I contact Krell, which is my next step, but seeing as I'd have to freight this for it to be repaired, I'm hoping someone here might shed some light on what's happening. I've made a short 15-second video of the issue, but I don't think I can upload it here. I'm happy to provide it though.

Any thoughts you might have would be appreciated.

Thanks,

Blake

blakeh
jasonbourne71's avatar
jasonbourne71
1,173 posts
 

Since the AC fuse didn't blow it is not drawing excess current.

jayctoy's avatar
jayctoy
4,040 posts
 

My plinius did exactly the you are describing OP all I did check the power cord and it’s loose. Problem solve.

retiredfarmer's avatar
retiredfarmer
342 posts
 

I upgraded  the power service  into my house to a 200 amp service.  Anyhow every system  in the house gained both sound quality  and a hum. I got rid of the old wore and went copper all the way. Had the electrician  come  again and had him check all his connections.  He tighten  the main ground. It was already  tight but he made it tighter and the hum was gone from every system in  the house. Above where the fellow says check the power cord that is free and only takes a few minutes  if it is not the problem it was free and o ly took a couple of minutes.  Sometimes  things are that easy and that cheap.

jayctoy's avatar
jayctoy
4,040 posts
 

Heavy power cord can turn loose either one iec of the amp or from the wall socket.

jayctoy's avatar
jayctoy
4,040 posts
 

Or if you add new gear next to your amp that can be the source too.My ViVa  integrated and my Ares denafirips DAC don’t get along. I get hum from my amp and speakers if I will connect the Ares to to viva.Solitions the two got divorce lol.

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