I was checking the AT's and they are a little expensive... it's something like 200$ 1 microphonee so it would be 400$ for a start and that's quite a lot at the moment. I'll keep them in mind for the future

I also checked the line transformer but now I have another doubt:
I think the connection won't fit I finally get this set - SPCMC2 > SPSPSB1, what type of connections do the transformers have? I suppose there are adapters but what is the exact type of adapter I need. The NJB3 has a 3,5" line-in connection, and I think the SPSPSB1 has the same kind of connection out.
The more I keep reading this forum the more confused I am

I hope I can keep learning from you

Thanks for your help,
Javi