Post #9 here suggests that the Bent Audio Mu actually uses Stevens & Billingham TX-103 transformers. https://theartofsound.net/forum/showthread.php?2907-Step-Up-to-the-Plate-Bent-Audio-Mu
Post #26 here shows the wiring diagram for 1:20 turns ratio: https://www.audionirvana.org/forum/the-audio-vault/analog-playback/phonostages/5397-step-up-transformers/page2
Post #26 here shows the wiring diagram for 1:20 turns ratio: https://www.audionirvana.org/forum/the-audio-vault/analog-playback/phonostages/5397-step-up-transformers/page2