Feature=Cartridge Research/Sound Field Correction by Delay/Simple Preamplifier/5 Pole PP Amplifier/VT-25A/Parts Research/Digital Recording/SR Techniques/Audio Quality Improvement of FM Stations Technology/CD Player Test System/Schematic: Western Electric 42-A, 43-A, 41-C/S61.3.1 Issued
※Shipping service. Special Feature Speaker Systems and Sound Creation/W Woofer System Vol.2/Bass Horn System/Exploring the Relationship between CD Stains and Sound Quality/BLT Amplifier Measurement and Hearing Vol.2/Tube Preamp Experiments and Production/Published Circuit Diagram: /Electro Voice TL303 Enclosure/TL405 Enclosure/S59.6.1 Published. The photograph is a sample, so the actual product may be broken, or there may be markings etc.
※Shipping service Feature = DC Preamp, Power Amplifier/FET2 Stone Power Amplifier/Step-up IC Power Amplifier/All-FET Power Amplifier/Vacuum Deposition and Audio/Tube Preamp Measurement and Audio/Tube Preamp Structure/Circuit Diagram: ALTEC 9844,9842,817,815 Enclosure/S58.12.1
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