Rummaging around the junkbox in an effort to find a 600:600 ohm audio isolation transformer, I found a possible candidate rescued from a store closure some time back. It's basically a cheap, low power unit that looks something like this:
Unfortunately, it came without a datasheet, but I had marked it 1:1 (probably after some quick measurements). Now the 600 ohm termination resistances are significant and I'm wondering how I might determine if this is actually a 600:600 audio isolation transformer. The inductance of both primary and secondary are both around 395mH, whilst the winding resistances are 40 ohms and 50 ohms (oddly, not quite the same).
What's the best way to determine if this audio transformer is designed with 600 ohm terminations in mind?