I too was comtemplating upgrading my VK-60 monoblocks to SE status, but at $5000 for both amplifiers, I felt the cost was too prohibitive. I have been told that even with this upgrade, the VK-60SE will not quite achieve the sonics of the VK-75SE. IMO, the extra money is proabably better spent on another set of BAT VK-75 or other monoblocks (new or used). In the meantime, I have decided to swap the stock 6SN7's with some NOS RCA tubes. While I do not expect this to necessarily elevate my VK-60 to SE status, it should add refinement to the already excellent sound of the VK-60.