2018/10/06

SANSUI AU-5500 repairing - 1

au5500-1.jpg

I was asked to repair the vintage amp from my friend!

Sansui "AU-5500".

It is an integrated amplifier released in 1975.

It seems that it has been used for more than 20 years as PA equipment, and it works by a considerable cigarette smoking condition. Switches and knobs that should be made of silver color was completely discolored into gold.

As a symptom of this trouble, the output protection circuit worked and no sound come out. In this state, I kept it because I thought that I could repair it.

To be honest, I am the first time to repair this very old audio product, so I am wondering what I am doing.

For the time being, I will examine the internal electric condition and the cause and countermeasures.
posted by toons at 03:52 | Audio