If you haven't done so already, don't pull the tubes without noting which ones go where. From what I have read on this forum, if you mix up the tubes in the FM secton it might throw the alignment out.
I scored one of these last summer. Traded it for my childhood train set. After going through a bunch of threads here I have determined that I will never let it go. I'm slowly restoring mine back to 100% performance and I will be adding some additional safety mods for the protection of the transformers.
Enjoy your restoration journey.
Chappy