question about the 搭棚膽後級

Hi everyone,

Happy New Year!!

I am planning to enrol 膽後級組裝班.  But I have a question wanna someone to answer.  If I made a 套件2A3搭棚膽後級, may I upgrade any parts such as transformer at anytime?
Thank you very much!

Because I am a new hand, so that I have no idea about the circuit.  Besides of replacing transformer, may I upgrade any components such as cap, resistor at anytime?  In my mind set, DIY item can be modified anything when I wanna change or ungrade the component.  Am I right?  Thanks Alfcat!

Thank you Cheaplow and Alfcat again.  I am glad to listen your suggestion.  First of all, I don't have any friend around me fever hifi (tube stuff).  Therefore, I don't have any chance to listen other tube amp or speakers for me to choose which style of tube I like to.  From Cheaplow point of view, I should take the course first, and then tell the teachers what kind of music I like to in order to choose which components (in amp) I should pick.  Am I right?

Now I am using JMLab 907Be speakers, the sensitive is 89db.  So do they fit in using 2A3 amp?  

I think I have a long way to learn.  Hope that course is my milestone for DIY hifi.  Thank you again.  

Besides of JMLab 907Be, I am going to buy a pair of speakers which sensitivity is around 94db.  Then is 2A3 good enough to drive them?  Anyway, I probably will attend the course because I wanna learn more about DIY.