2. amps-preamps
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Krell Service - speakers buzzing

I recently started experiencing a buzz in both my main speakers, After lots of troubleshooting, I believe the issue is my pre-amp. When the pre-amp is on or off/stand-by, the buzz is there. When actually unplugged, the buzz goes away. It is a Krell KAV-250p. I bought it used in 2013. My questions:

1. Why is it causing buzzing? I am more curious than anything.

2. Is there any point in trying to replace the cables between the preamp and amp (XLR type)? When I unhooked them the buzzing went away, presumably because there was no longer a connection between the pre-amp and amp. My assumption was since both speakers are buzzing, that is not the answer.

3. If you all think the pre-amp is the issue (and there is nothing else I should try in terms of troubleshooting), can it be serviced? Is it worth servicing? I like it. On the other hand, always fun to upgrade a piece of equipment, except everyone tells me the KAV-250p is a good unit.

Let me know if there are any other details I can provide. Thank you.

 

Jeffrey

olfac87

Showing 1 response by erik_squires

erik_squires
15,788 posts
 

It could be an incoming power issue but just as easily could be a power supply issue and should be serviced soon. Disconnect all the inputs to see if the problem stops.  If it still happens, take it to another room or building to see if the buzz magically goes away.

Another possible thing to try is to turn off everything (and I mean everything) else in your house. Turn off any other devices on the circuit, and turn off all other breakers. If your buzz goes away you may have DC or a noisy power supply somewhere in the home.

Otherwise, no, your preamp sucks, it’s trash, and you should send it to me to save you the cost of recycling.... 🤣

Seriously though, the last thing you probably need to worry about is your cables. 

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