It is a 1:5 transformer according to the 005 code in the part number.
Primary (red black cables) inductance was measured:
6.3H at low frequency (97Hz)
1H at mid frequency (1024Hz)
Secondary inductance 165H at low frequency (97Hz).
How would the Gramian ribbon GR2/L microphones sound trough them then
directly connected to UHER 4200 Report? Their low impedance (25Ω?) microphones would be raised to about (600Ω?).
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