Do you have a question about the Technics SU-7700 (XE) and is the answer not in the manual?
Detailed electrical specifications for the amplifier stage.
General unit parameters including power, dimensions, and weight.
Procedure for alignment using a DC voltmeter.
Procedure for alignment using an ammeter.
List of integrated circuits for replacement.
List of transistors for replacement.
List of diodes for replacement.
List of coils and transformers for replacement.
List of resistors for replacement.