Mystery transformer
"GRe" wrote in message
...
Some time ago I found a small transformer in the junkbox.
It looks old, like from the forties or fifties era.
I don't remember where it came from or was cannabilized from.
Anyway, today I took the trouble to measure it.
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???
Telephone application?
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