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 50Hz - 15kHz).
Primary taps are 1, 2, 4, and 8 watts.
Secondary impedance is 4Ω and 8Ω.
Model HT-87 is designed for use with 70.7-volt lines.