Just a side note; It could be a short lived sonic experience if you don't watch the maximum plate voltages. NOS 6SN7's can run from 275 VDC (for a 5692), up to 450 VDC for a 6SN7GTB series. You should contact your amp manufacturer before dropping serious $$$$ on NOS to see what the electrical environment is for this valve. Also, some power amps use 6SN7's in both the input and driver section and again you may have two different values to deal with.6SN7's are alot of fun, especially in flavoring preamps!Good Luck!
