Skylab
Reviewerus Prolificus
I wouldn't. Putting aside for a moment the issue of whether the 336i can handle the 6SL7, which I think I have read it can but I wouldn't guarantee it, the 6SL7 doesn't pair all that well with the 6AS7. It will not sound as good as a 6SN7, even if it will work without damage (again, no guarantee of that).