MENTAT designer: bested your preamp at ~1978 Snell-Chicago CES. Then a Ph.D. candidate -since, a retired university professor. AMP-1 remains reference with heavily modified Strickland monoblocks. Made audible improvements to AMP-1 by improving linearity & transient response of output's power supply. Via thermal fans, discrete regulation, mica washers, & 5% bias decrease it has yet to fail since 1982.