Restoration & repair video for this Hitachi trk-3d80 portable radio cassette tape deck from 1986. Teardown and clean up. Re-cap - replaced all of the electrolytic capacitors. The IF IC replaced was a Toshiba TA7640AP. Also replaced the op-amp (operational amplifier). All of the input sources run through the op-amp before the signal enters the power amplifier, and so replacing with a newer (better specification) part will improve the sound quality. I replaced op-amp C4558C with a NE5532P. Also repaired the cassette deck, replacing the rubber belts and cleaning.
I love the sound these Hitachi '3D' series boomboxes make, the separate sub-woofer bass speakers really make for a great sounding unit.
Apologies for the 6 minutes of vacuuming! I had intended to time lapse that part...
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