Sony Audio (input) transformer

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A fiend of mine give me two transformer from Sony professional mixing console.
They are in square metal can. Symbol on the top: T-9413-575-4.
Primary 80Ohm, Secondary 1.4KOhm. Ratio 1:5.
I check bandwidth and they looks great !!!
Does anyone use this transformers or have access to data-sheet ?
 
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