I missed the one on episode 52 "Steal the Ultra Life" of Ultraman Taro, Hideki Go did a quick transformation in that episode. Other than that, it should be all the transformation of Ultraman Jack. Let me know if I've missed anything else. I grew up watching this show and it has meant a lot to me. Hope y'all enjoy.
Also let me know if you want me to do other Ultraman's transformation video!
EDIT: 03/22/2023 - Rest in peace, Jiro Dan!
Watch the full show on YouTube here:
https://www.youtube.com/playlist?list=PLT7obiC2E-oD-GLdw6qpDosDTURF9Uxnw
Credit: Tsuburaya Productions
https://www.youtube.com/user/tsuburaya