Anyone with Sescom MI-52 mic transformer datasheet

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GN - GN/ WT  50k winding. (6k4 dc)
BU - YE.  400 ohm winding.  (35 ohm dc)
BK - OG.  400 ohm.  (32 ohm dc)

From BU & BK tied to YE & OG tied is 26 dB @ 1kHz
From YE to BK with BU/OG tied is exactly 20 dB @ 1kHz

I'm measuring 26 dB gain or atten, depending which way you go
 

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