The LL1674 is a large, high signal level audio transformer built with the well know Lundahl amorphous core. The LL1674 consists of two coils, each with a two-sectioned primary winding and a high level secondary winding separated by electrostatic shields. The core is a two-component amorphous strip core. The very high mu of the core results in a phase shift of less than 0.5 degree at 10Hz. The transformer is magnetically shielded by a mu metal housing.Spacing between pins: 5.08 mm (0.2")Spacing between rows of pins: 30.48mm (1.2")Weight: 80 gRec. PCB hole diameter: 1.5 mmStatic resistance of each primary (average): 33WStatic resistance of each secondary (average): 605WDistortion (primaries connected in parallel, source impedance 150W ): 22V rms (+29 dBU) secondary level, 30 Hz: 1% 22V rms (+29 dBU) secondary level, 50 Hz: 0.2%Self resonance point : 70 kHzOptimum termination for best frequency response (source imp. 150W ) : No termination requiredFrequency response (source 150W , load 10k): 10Hz – 45kHz +/- 0.5dB -3dB @ 80kHzIsolation between primary and secondary windings/ between windings and shield (rms): 3 kV / 1.5 kV
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