Repair of Aiwa P180 power amplifier

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Pholo

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I've got this vintage stereo power amp rated 150w RMS and matching C80 preamp. Power needs ICs as it now powers on but no sound output. This is opinion of a technician that also said he can't source these ICs as they obsolete. Can these be replaced by others to get it working again. Preamp plays flawlessly and is currently hooked to a Nad 2150 power amp.
Please assist as I really enjoy this baby monster much
 
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