The HT87 is a Industry standard, high quality transformer with audio grade laminations.
The unit offers low insertion loss (not to exceed 1.0dB) and full-range frequency response (+1dB from 60 Hz to 12 kHz).
Primary taps are 1, 2, 4 and 8 watts. Secondary impedance is 8 ohms. Model HT-87 is designed for use with 70.7-volt lines.