【Overview】 ・This item is a repaired and restored piece of junk from approximately 50 years ago. While all functions have been confirmed to operate normally, it is being sold as a junk item due to its age. Occasionally, there are people who make claims unrelated to basic functionality and demand a return. We kindly request that only those who appreciate the value of a retro, repaired item purchase this product. 【Product Description】 Product: Integrated Amplifier Manufacturer: Technics Model Number: SU-7700 Release Date: Around 1976 Price: 45,800 yen 【Appearance】 ・The front panel is clean and rust-free, but some markings are faded. The chassis has no dents and the paint is not peeling. Considering it's an approximately 50-year-old device, it is in almost pristine condition. 【Repairs and Adjustments】 ・Main volume, electromagnetic relay, etc., ultrasonic cleaning with ethanol ・Differential amplification circuit, pre-stage voltage amplification circuit, NF circuit repair ・Complete replacement of final stage power transistors ・Output power meter internal lighting, converted to warm white LEDs ・Function switch, main volume, etc., cleaned 【Operation Check】 ・All functions, including the PHONO equalizer amplifier, are operating normally. (Please be sure to ground when using PHONO input) ・Effective output (1KHz, both channels driven, 50W + 50W) 【Sound Quality Check】 ・Since the differential amplification circuit, pre-stage voltage amplification circuit transistors, power transistors, and electrolytic capacitors have been replaced with new ones, the noise and distortion are low, and I feel it produces very good sound for a 50-year-old amplifier. ・The idling current is set higher to operate in Class A during low-signal output. (It basically operates in Class B) 【Accessories】 ・None 【Reference】 https://audio-heritage.jp/TECHNICS/amp/su-7700.html