MEASUREMENTS
Apr 12, 2022
3 minutes
—John Atkinson
I measured the EMT 128 phono preamplifier (serial number U-102) with my Audio Precision SYS2722,1 repeating some of the testing with the magazine’s higher-performance Audio Precision APx500. The results were consistent with both systems.
The output impedance, specified as <500 ohms, was a relatively low 320 ohms at 20Hz, 312 ohms at 1kHz, and 246 ohms at 20kHz. The 128 inverted absolute polarity; either the XLR output jacks are connected with pin 3 “hot” or there is an odd number of anode-coupled
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