Audio Transformer Data

Transformer Make / Model Marinair LO1166/A Test Circuit Notes

Voltage Ratio Pri/Sec (approx turns ratio) 1 : 1.68 1 Test circuit 1

Calculated Impedance Ratio 1 : 2.82 Impedance Ratio = Voltage Ratio squared

150 : 423 Nominal Impedance Ratio

Voltage Gain at 2 KHz +4.44 dB 1 Sine wave input level <= Max Level, Unloaded secondary

Voltage Gain / Deviation at 20 Hz +4.30 -0.1 dB 1 Voltage Gain | Deviation from 2K Level, Unloaded secondary

Voltage Gain / Deviation at 20 KHz +4.39 -0.1 dB 1 Voltage Gain | Deviation from 2K Level, Unloaded secondary

HF Peak Frequency 129.4K Khz 1 Unloaded secondary. Subject to test probe capacitance.

Gain at HF Peak +4.1 dB 1 Unloaded secondary

Usable Frequency Range (+/- 3 dB ref 2 KHz level) <10 Hz to 150 KHz 1 Lower limit of testing = 10 Hz, Unloaded secondary

Max Level at 20 Hz (1% THD) + 31.4 dBu 1 Unloaded secondary

Secondary Loading Loss 1.1 dB at 600 Ohms Unloaded voltage gain minus loaded voltage gain

Primary Secondary

Configuration Series Series

Rated Impedance (ohms) 150 600 In italics if calculated, non-italics if mfg specified

DC Resistance (ohms) 14.2 43.6 2

Impedance at 20 Hz (ohms) 255 700 3 Opposite winding unloaded

Calculated Inductive Reactance 241 656 Impedance minus DC Resistance

Calculated Inductance (Henries) 1.9 7.0 Calculated from Inductive Reactance at 20 Hz

Test Circuit 1 Test Circuit 2

Test Circuit 3