Seemeng,
I always photograph the locations and valve types before I move onto any replacements. As a new Shindo user, I have gone on to open and test my previously owned Monbrison and Montille EL84 to confirm condition and check existing tubes, ect. See the photo of my Monbrison, S3-016.
https://www.flickr.com/photos/187500...posted-public/
I have labeled the tubes as found in my Monbrison. This may not be yours though. Good luck.
J