ADCOM GFA-555 II Stereo Power Amplifier . MADE IN USA

ADCOM GFA-555 II Stereo Power Amplifier. Working, great sound. MADE IN USA. ADCOM GFA-555 II THD at power limits at 1 kHz. It puts out a clean, continuous 265 watts per channel into 8 ohms. It puts out a clean 370.5 watts per channel into 8 ohms on tone bursts: a 10 ms burst of 1 kHz (10 cycles) at 1 per second: 77V Pk = 54.447V RMS = 370.5W RMS burst power at 2.3600 V RMS input (120.1V AC power input). I measure: 0.002% THD at 200 W. 0.0022% THD at 216 W (1.8V in) 0.0028% THD at 241 W (1.9V in, 808W from wall at 117.5V) 0.014% THD at 253 W (1.95 V in, 117.5V from wall) 0.057% THD at 256.5 W (1.96V in) 0.1% THD at 257.2 W (1.963 V in, 117.5V from wall) 0.11% THD at 258W (1.965V in) 0.18% THD at 259W (1.97V in) 0.68% THD at 265W (2.0V in, 845W from wall) Unloaded, I measure 57V RMS at 0.1% THD (120.5 V RMS power

Condition

Used (normal wear)