Attention: Some transformers exhibit a much larger inductance at lower frrequencies due to the magnetic core material used. Many of the measurements below may have been done with a high frequency. See for example the Altec 4722 measurements.
Altec Pearless 4722
110mH : 377mH : 800?H
The primary 200Ω winding is 377mH at 1028Hz but 3H at 97Hz (property of the core material)
Grundig GDM311
Auto transformer inside
10mH : 140mH : 118H
Meazi Ribbon Microphone
0.16mH : 330mH
Sowter 3104 (1:10) or 1:20
3.9H (centre tap): 470H (secondaries in parallel)
BBC LL/210A
102mH : 336mH or 1.75H (2 secondaries in series)
MD21 HL s/n 13371
766mH at 1028Hz (4.25H at 97Hz) : ?
Coles 4038 internal ribbon transformer
secondary inductance :7H
630 turns secondary, 0.017mm? wire diameter
17 turns primary
Canford inline XLR to 1/4in adaptor
413mH, 1.6H at LF : 95H
There may be systematic errors from the Escort LCR meter.
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