These are the same as in Audix 35102 - line in xformers, very similar to 31267.
Thomas TK provided this over at Aurora Audio:
http://www.auroraaudio.net/dcforum/DCForumID1/445.html
The T1448 was also used as a line-in transformer in the Audix 35102 channel amp.
Marinair T1448
This is a line bridging transformer. Designed specifically to isolate equipment with previously unbalanced input arrangment, this transformer may be inserted without serious loss of level.
10k/2k5 : 9k6/2k4 ( 2 x 5k : 2 x 4k8 windings )
Secondary load: 9k6 (rated)
Input impedance: 10k
voltage ratio-insertion loss:1dB
Frequency response (600ohms source, 9k6 load): +/-0,3dB (20Hz-15kHz and -0,5dB at 20kHz
Distortion: <0,1% (above 40Hz) and < 0,01% (500Hz-10kHz)
Squarewaves: No overshoot, no ringing,
Thomas "TK"
Vintagedesign
Sweden