No the stock ones are 6DJ8 and not 6SN7.
Improving the high end on SA100 (stock, based on my experience with the SA220) means u need to replace the coupling caps AND swap out the 6DJ8 with a something that has sparkle like the Telsa (new JJ or NOS)
Now if your SA100 has been "altavista'ed" thats another story.
Improving the high end on SA100 (stock, based on my experience with the SA220) means u need to replace the coupling caps AND swap out the 6DJ8 with a something that has sparkle like the Telsa (new JJ or NOS)
Now if your SA100 has been "altavista'ed" thats another story.