[quote author="Gabriel Sousa"]Hello, ppl
Is the mic. tranformer important to the sound ?
has anyone test more the one mic. transformer on a mic, to test if there are difference in the sound ???
:twisted: thanks[/quote]
The transformer is as important to the sound as anything else--capsule, grill, body, capacitors, tubes, PSU, cables...
Only your ears can deside however, what kind of difference any of these make. It will also depend on your application. It will also depend even on your mood. Very often I like the sound today, the very next day I think it doesn't sound good at all, the third day I come back thinking: "What's the heck was I thinking yesterday".
I love pickles, my wife hates them. She loves olives, but I hate them. All of the transformers you posted are good, and there is a big difference between all of them. You will hear whole range of opinions, but once again, try them out and see what do you like and what suits the best for your applications. Only you can decide this.
I have heard lots of guys swapping the transformer in rca 74b's with a lundahl and everyone has raved about it, but I havent heard one in person to comment.
The RCA line has very good transducers, but their transformers... might be better. Varoacoustic's one is particularly bad, stock 74 is not that good. 77 also might benefit from changing its trafo. Lundahl, due to its amorphous core, has its own sound, and although lately, I have some second thoughts if I
really like it, still it is a very good trafo and I always want to have it handy.