What does the Topping sound like?
That's a Class D chipamp, right?
Usually the problem with the A77 are the heads (anything more than 4mm of wear will cause dropouts, especially with the 4 track models) and the (frako) condensators, which go up in smoke. Also the pots are usually causing trouble.
A '67er A77 is an MK-I, which is quite rare.
If your heads are in good nick (the usually aren't...), it's really worth replacing the pots and the condensators. These machines can sound brilliant.
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