OEP A187A15C Microphone Transformers A187A15C microphone transformers from OEP are ideal for impedance matching and signal splitting. They are encapsulated in a shielding mumetal can and constructed with multiple electrostatic screens. These audio transformers match 150 Ω to 150kΩ. A187A15C audio transformers are suitable for use with high impedance FET and tube amplifiers. 5.3 H primary inductance at 100 Hz, 0.1 v
280 μH typical primary leakage voltage at 1 khz, 0.1 v
130 pF interwinding capacitance at 10 kHz, 0.1V (winding to winding)
254 pF interwinding capacitance at 10 kHz, 0.1V (primary to screen)
260 pF interwinding capacitance at 10 kHz, 0.1V (secondary to screen)