[michael1978]

You will need to decide the purpose of the transformer. Is it to change the impedance or to provide a tuned circuit or both. The traditional IF transformer has an input winding and an output winding, both tuned with a capacitor and critically coupled together.

The transformers are often wave wound to reduce coil capacitance - not easy to do.
The wire may be Litz which is multiple very thin strands, all of which must be soldered.

If you want to change impedance at a high frequency, then the transformer can be wound on a ferrite toroid.

You need to specify frequency, bandwidth, power and size. If you can find one with the characteristics you want, it may be possible to copy it.

i dont know still, but can you show just one easy example

 

[michael1978]

hello one more time i read fast, it says if transformer 455kh

 

[Miguel Lopez]

Hello i search on th internet , you mean this one
http://sm0vpo.altervista.org/blocks/if-txfmr_tube_00.htm

Exactly. That's the one

 

[michael1978]

Exactly. That's the one

thank you its perfect thanks a loooottttt