JENSEN (USA) – Low Level Audio transformer
Model: JT-DB-E
Made in USA
Extract from the datasheets…

Supplied complete in the original SEALED box and with the original datasheet, test circuits
BRAND NEW OLD STOCK
COSMETIC CONDITION:Excellent, just been sitting on the workshop shelves with all the other audio spare parts!
So that the ‘virginal’ aspect of this product isn’t spoilt, I have NOT even opened the box/lifted the sealing tape.