Comments on Profile Post by pure5152

what is the usual input transformer on the 3F?

LL1676 (amorphous) LL7903 (nickel). Both have an effective turns ratio of 1:2, giving 6db gain, which is too high for me.

I have the LL1676, so wanted a 1:1 (0db gain) amorphous transformer. There are three, LL1684, LL1948, and LL1690, ordered least-most in windings. I chose the 1948 for the right balance of high inductance and low resistance.

When choosing a transformer, you want the lowest resistance and highest inductance for low signal loss while having a high enough signal capability. Mainly winding number, core permeability, and core size affect this. Amorphous has higher permeability than nickel and all input amorphous are similar size, so the right balance of windings was important. The 1948 seemed the best compromise after extended research.

Looking forward to your write up pure5152! Heck, keep is short and simple, a paragraph or three, just to help ignoramuses like me understand the basic trade offs.

Yeah of course crenca! It was a fascinating learning experience going back and forth with doug and also reading white papers/textbooks. I wish I could write more here but there’s a 420 character limit. I’ll definitely explain in my write up later.

I went a bit overboard and decided to get the silver version of the LL1948 (LL1948ag), after hearing craig praise its sonic qualities: https://eddiecurrent.com/228-2/