The Vanguard's maximum output level when decoding a full-scale, 1kHz sinewave was 2.25V from the fixed-level outputs and 4.31V from the variable outputs at the highest volume-control setting. These values are 1dB and 6.7dB higher than the standard 2V output, respectively.
Output impedance was a low 50 ohms at any audio frequency from the fixed-level outputs. The variable outputs were similarly low, measuring 65 ohms at 20Hz and 55 ohms through the rest of the band. The combination of low output impedance and high output level suggests that the Vanguard…