From: phil_a@tpg.com.au   
      
   "GRe"   
      
   > Winding W1:   
   > Rdc = 32ohm   
   > Saturation at about 50V, W2 open   
   > Inductance 8.82H @ 10V/50Hz   
   > Inductance 6.58H @ 10V/100Hz   
   >   
   > Winding W2:   
   > Rdc = 29ohm   
   > Saturation at about 37V, W1 open   
   > Inductance 5.36H @ 10V/50Hz   
   > Inductance 4.11H @ 10V/100Hz   
   >   
   > Winding ratio N = 1.34   
   > Impedance ratio = 1.79   
   >   
   > F-response -3dB @ 27kHz with a 600ohm load on W2   
   >   
   > +3dB @ about 80kHz with (almost) no load on W2   
   > +22dB @ 186kHz resonance with (almost) no load on W2   
   >   
   > Iron lamination dimensions 48x40x20mm   
   > It's "tarred" and has NO airgap   
   > Beside end taps, no additional taps on W1 and W2   
   >   
   > What could the purpose have been?   
   > Anybody any idea???   
   >   
      
   ** Almost certainly it's a high quality, 600 ohms line driving transformer.   
      
   The primary impedance is about 1000 ohms and so suits cathode drive from a   
   small power tube, via a coupling capacitor.   
      
   Max operating level is about 10 volts rms, with 13 volts drive on the   
   primary.   
      
   Line receiving versions were usually fitted into a ( mu-metal) shielding   
   can.   
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)