Are these transformers worth keeping?

[PRR]

> 20R on the primary and 700R on the secondary. ...how would you do the math to determine that it's a 150:10k step up just with that info?  Or would you feed it power...

ASS-ume that happy audio impedance is ~~~10X the DC resistance. So first-guess, 200:7K. That does not confirm 150:15K, but rules-out 8 ohm to 200K or 600:600.

If you "feed it power", remember this is a MIKE transformer for WEAK signals. You need to pad-down your signal source, maybe below 100mV. Otherwise you just get mangled waves of uncertain value and large frequency effects.

 

[ruffrecords]

You really need to feed it a real signal and measure. Secondary wire is often fine than the primary so it might have higher than expected resistance. Also, because the secondary has more turns, the average length of the turn is bigger because its coil is bigger so the length of wire used is longer and it is length that determines dc resistance. Feed it a fe tens of mV and see what it puts out.

Cheers

Ian

 

[JohnWatkins]

Ok, thanks.  I'll see if I can push something to it from the DAW and take some before and afters.