Feature=Considering the origin of Hi-Fi hobby/2-stage CRFET preamplif/End-stage No-FET Power Amplifier/MC Dedicated FET Preamplifier/DC Microphone Amplifier/Tone Arm Measurement and Listening Vo-3/ Headphone/Digital Filter/Schematic: Urei model 525/Footer Man OTL-3/S58.10.1