The only changes are positive ones - a grounded power cord and a filter cap change.
This one is loaded with original Utah speakers from the 18th week of 1964.
All power transformers and pots also date to early 1964.
The tube chart is stamped NG for July, 1964.
New power tubes just installed as the amp was checked out by my tech prior to listing.
The amp sounds amazing, runs quiet and has no issues. There is light cosmetic wear here and there, but overall it is in excellent condition or better.
I will double box the amp for safe shipping and will bag the power/rectifier tubes as well as the power cord to keep things away from the speakers.