Nakamichi CA-7A Clicking sound

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Anybody can help me? I have Nakamichi CA-7A preamp, I have problem when I turn off power I heard clicking big sound from one channel. I had check power amp with another preamp working good, when hook up CA-7A to another power confirmed problem from CA-7A. I had checked all caps in power supply and within specification. Any idea?😕
 
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