I do not know from what Yamaha amplifier?please help

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Yamaha A-1000 used to use those caps and a GA6690 transformer. Could be from one of those or similar.

You can probably use them for a project if they test good.

But to test the transformer safely you need to understand basic electrics.

By the way, make sure those big capacitors are properly discharged as they can store lethal charge.
 
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