Trying a set of KT-120 in my premier 11-A

[repman]

I just got an email from Ed answering one I sent him regarding the KT-120 tubes and if they are compatible with a Premier 11-A amp.
Ed replied back that it was always drilled into him to only recommend the tubes that came originally with the amp from the factory. He said he was told that he could make an exception with the KT- 120 and he could recommend it as a replacement for the original 6550 power tube however the tube cage would not fit because of the height of the KT-120.
I just ordered a quad of these to try, has anyone here used these in a
11-A ?
I will give my impressions of this amp with this tube after burn in.