PS Audio BHK lacking..

If the sound doesn't change for the better you should call PS Audio and see how they suggest you proceed.

Tunsgrams are the way to go though anything is better than the stock PS Vanes. Upscale audio has the specific Tunsgrams and it is a different tube type so you have to change a jumper on the amp when you swap the tubes. 

I had serious buyers remorse until I rolled in different tubes.  With the better tubes, it is a very nice unit.   

As tubes age they at the 'end of their lives' sound pretty lackluster.The gold lion tubes that PS Audio recommends are fine tubes but emphasize the mids and bass.A faster sounding lively tube is the JAN Phillips 12AU7.It's one to put on your list to try.

Thanks guys, I emailed PS & I'm looking at a tube change.

Hi fertguy

If you try some high quality nos tubes in the BHK Signature preamp it will transform that preamp into a very good sounding preamp. Either a 12 volt 12au7 from either Telefunken, Mullard, Amperex or Siemens from the 50’s or the 60’s should sound great. If you change the two jumpers to the 6 volt settings and the 5 milliamperes bias settings then either a pair of 6922’s, 7308’s or 7dj8’s will sound great as well. BHK’s favorite tubes are the Tungsram 7dj8’s from the 60’s. Any of these nos older tubes will elevate that preamp to a whole new level. Best of luck.

Scot