I think those are pretty darn expensive. But as another poster said in the other thread, the 7N7 may be cheaper but it is up to you to figure out if it sounds good enough. I have no idea how those 5692 tubes sound. Maybe luckily for me I never really played around with 6SN7. I just went straight to the 7N7 from the 12au7 in the Foreplay. But I have been very happy with the sound and haven't looked back, as have others who have tried them out. No way to know for sure how YOU are going to feel about it except to hear it.