zaraxisof said:Thank you Jakob, yeap right, ohm numbers say nothing from themselves. I will finally end up with OEPs. But i am thinking of also trying a pair from a local well known winder old man here, for one channel, just for experiment. He can wind them for me in any ratio and specs desired for really low cost, a few bucks both like. He usually builds power and power out trannies for valve circuits and is well known for this here. Different story i onow but he has also built some in and out audio trafos in tube pres and mics for other guys with good results as they say. So why not taste too?
I know he uses M6 core, open type and told me he could get about 20-20K, 0db ( ???). Didn't spoke a lot about inductance when i mentioned to.
So according to your scheme what would you suggest i could tell him wind? I know again it's very generalized and vague but just a starting point. Don't hurt experimenting i guess. And if they don't "pass the tests" i could probably use them for smthng else in the future.
Told him about 1:5 (600:10K) for input and something like 4:1 (2400:600) for output. 250-300mV and passed him the scheme. He understood we have to do with mWatts here indeed. What other points should i mention to him?
I wish I had such a winder here in Berlin!
Your math is wrong.
The impedance is quadratically related to the turns ratio. For example, a 1: 5 transformer has 600: 15K impedance, i.e. multiplied by 25. A 4: 1 transformer has an impedance of 10K relative to 600R, i.e. divided by 16. The 2400: 600 you mentioned would be a 2: 1 transformer.