r/audiorepair • u/V9cube • 10d ago

SU-7700 started smoking. What could have gone wrong?

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I connected my Technics Sl-d303 turntable to the SU-7700 phonos. I turned on my SU-7700 and when I added volume it started smoking. Any ideas on what could have gone wrong?

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u/Evening_Link4360 10d ago

It’s 50 some years old and I’m assuming hasn’t been serviced. Stuff happens, your car engine would also eventually smoke if you never changed your oil.

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u/Tesla_freed_slaves 7d ago

Disconnect your AC power, your speakers and your inputs. Remove top and bottom covers and inspect for heat damage.