The A-77X was a slightly lower power version of the A-88X integrated amplifier and had fewer controls than those on the A-88X.  However, its construction and internal component quality was identical.  The A-77X was introduced about a year after the A-88X and a lower power and lower cost version of the top-of-the-line Elite amplifer. 

Note the large speaker cable binding posts on the back of the A-77X, the same used on the A-88X.  It had inputs for phono, CD player, tuner, tape deck and one auxiliary input. 

This is a closeup detail of the front panel of the A-77X showing the features of this superb amplifier.