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Buzzing sound from Peachtree Nova 150 - anybody else had similar experience?

I bought Peachtree Nova 150 around 10 months ago. While I was very satisfied with the amp to begin with, I slowly started getting more bothered by the high frequency buzzing it makes when it is powered on. The sound comes from the device itself, not from the speakers, very high frequency, similar to the sound from old CRT screens. It is very noticeable when standing close to the device, but if it’s otherwise quiet I am also hearing it as long as I am in the same room. And though I probably will be able to ignore it while playing music, it does bother me as long as there’s a pause in the music or while watching movies. I don’t think I am being overly sensitive, I have other electric devices that make far more noise, like my projector or hard drive RAID, but it is just the high pitched whine from the Peachtree Nova that bothers me. With simple measuring software on my phone, the sound is measurable from about 1 meter from the device, and shows up as a sound with a peak of 8 kHz and a smaller peak at 16 kHz.

After I sent complaints to the dealer I bought it from, the the amp was sent back for repair. Twice. Both times it came back with absolutely no changes to this issue, as far as I can hear. The guy who did the repairs measured the sound after the last repair to be "significantly reduced". But I can’t hear any difference. He indicates that the current in my house can be the culprit, but I have also tried it in my office building, both in grounded and ungrounded outlets, without any changes to the buzzing. What I haven’t tried yet is any kind of expensive AC filter to deal with noise. Could I expect that such a filter (fx IsoTek Corvus) would make any difference here? I am hesitant to try it, since I wouldn’t expect that a relatively expensive amp (for me) would need such a thing just to function properly.

That the repair shop claims the sound is "reduced" indicates to me that some kind of buzzing from the device itself is to be expected, just that it should be at a significantly lower level than what I am experiencing. Is this on par with with what other owners of Peachtree Nova have experienced - could I expect it to be dead quiet?

It seems to be the same issue discussed in this thread.


oysteinvidnes
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almarg
9,670 posts
 
By any chance are the speaker-level outputs of the amp connected to a powered sub, or to a speaker that incorporates a powered woofer, or to anything else that is powered?  If so, given that the speaker-level outputs of the Nova 150 and 300 are described as being differential, and the negative output terminal as well as the positive output terminal therefore has a full amplitude signal on it (which might be grounded via some unknown impedance in a powered speaker or sub), that could conceivably be the root cause of the problem.

Regards,
-- Al
 
oysteinvidnes OP
5 posts
 
The sound is the same without anything connected (except the mains cable, of course), and whether or not the outlet is grounded.
oysteinvidnes OP
5 posts
 
I received a current filter that I had ordered, but using it makes no difference whatsoever. 

I am now in contact with Peachtree, and they are willing to replace the power supply in my Nova 300. I am glad they are taking this seriously, but at this point I am not confident that the issue will be resolved, since I already went through the very same process with one unit of the Nova 150. Maybe I’ll give it a shot, but I am guessing that the Novas in general just don’t play nice with the mains line in my area. Or I am being way more sensitive about this than any other Nova owners. But I really find the buzzing unbearable.

Here’s a recording of the sound (sound begins about six seconds in, turning on the unit first).


oysteinvidnes OP
5 posts
 
I don't know if this interests anyone at all anymore, but I thought I should just post a follow up to this story. I have been in contact with Peachtree about what to my ears is a buzzing sound from their amplifiers, and the conclusion basically is that I am overly sensitive. Their techs can not hear any sound at all from the amp on the recordings/videos that I have sent to nail the issue (like this one -- to my ears the sound comes on about 3 secs in). So basically I am hearing something that they are not able to hear. But to me, unfortunately, it is quite irritating, and not something I can accept. I am now just hoping that they will let me return the unit in exchange for a refund.




kevinjkim
4 posts
 
I just received my nova 300 from my brother in Detroit.  I’m experiencing the same problem with the buzzing.  Especially through my headphones.  I have the th900 mk2, all the colors. The utopia, and the LCD-4Z and I’m hearing the buzzing noise from all the headphones.  I purchased the b-stock on eBay. Assuming it was refurbished, a return.  Now that I currently reside in South Korea, I have no idea how I can contact Peachtree to try and resolve this issue.  Usually most headphone amps are dead silent, I’m hearing buzzing noises when the music is playing.  Especially when the high starts to go up, I’m hearing like distortion like noises, low continuous  zzzzz noises and buzzing.  It’s very annoying.  This is through usb-a and usb-b.  I’m listening it through tidal on my iMac, iPad, and my iPhone. I hear the buzz when even the music is paused!  Hear it when I play them.   I don’t know how Peachtree missed this issue.  The noise is very obvious.  My HEGEL H360 or my Allnic 5000XL tube amp have no issues.  They are all plugged into the same outlet.  I’ve tried plugging the nova300 separately.  Same problem, different location.  
OYSTEINVIDNES, it’s not you, it’s the amp. If anyone has a solution, please feel free to post a message! 
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