This is my first post here. I’ve been a proud owner of DS DAC Sr. MK1 and BHK Signature Premp. I recently added the preamp to my DS DAC feeding my Purifi amp. I never thought a preamp could make such a drastic difference, but I’ve been thoroughly enjoying the BHK. I’ve also been rolling tubes and the experience has been like having multiple preamps with different tonal qualities.
One quick question I have. When I plug in the headphone (Sennheiser HD6XX, and Momentum Wired), there is a noticeable buzz if the volume display is shown on the screen. When I dim the unit, the buzz is significantly reduced. PS Audio recommends I send it in for a checkup, but I wanted to make sure if other BHK owners have a similar experience. If this is by design, I rather save my preamp going through a round trip shipping. I appreciate any fellow BHK Premp owner’s feedback.
I don’t have a MK1 or MK2 any longer. I did have both. When I had the MK1, I did use the BII until I removed it and put in a Jeff Richards power board and some other mods. When I did have the BII in, I liked it. But the power board and mods did make the MK1 sound better, so I started to use a Sonore Signature Rendu SE to stream via USB to the MK1.
This is really interesting. I unplugged all inputs and the BHK still buzzes. Much louder when the volume display is on. When off, it’s a very faint sound of electric interference. BHK is supposed to be the state of the art headphone preamp, and I was hoping to upgrade my can, but this is a bit disappointing. I wonder why some would and others wouldn’t. Do you have any other inputs plugged into the preamp?
Wonder if any other BHK Preamp owners can chime in.
I don’t hear a buzz with the screen on. Knowing that Paul does and I don’t is a bit confounding. I can’t explain it. Especially if it’s a design issue.
I know I would have noticed a buzz prior because when I was testing FW for the MK2 I often went back and forth between speakers and headphones. During that period I know the screen was on as I was paying attention to volume settings between Roon and Audirvana streaming to the MK2.
Thanks for testing this. I hope this is something that can be fixed by PS Audio. I am hoping there will be a few more confirmations from other BHK Preamp owners to make sure that the buzz is not a universal problem. I am a little hesitant to ship it back to PSA at this point due to the cost and the possibility of it coming back unchanged.