707系列是1976年的产品。以下资料不知对您有用否。
AU-707 Series (1976)
The first generation of 07 Series. Called DC amplifiers since no caps were used on output stage. AU-607 was called as AU-517, and AU-707 was called as AU-717 in the international market. AU-717 was the top model, and there was no AU-907 being introduced. AU-707 was sold at about $360.00 in Japan
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