I asked a different question because it just happened to me again:
When I was about 12-14 I used to be able to hear when a tube television was turned on somewhere in the house because I heard a high pitched sound when it was turned on. I’m 61 years old now and I just heard the same sound, it lasted for about 30 seconds and then faded away. What happened?
What you experienced is actually a well-known mix of physics, electronics, and changes in human hearing, and the fact that you noticed it again at 61 is unusual but not impossible.
What you heard as a kid
Old CRT (tube) televisions produce a very high-frequency tone, typically around 15,734 Hz (NTSC horizontal scan frequency).
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Children and teenagers can usually hear frequencies up to 18–20 kHz.
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Many adults gradually lose sensitivity above ~12–15 kHz (a process called presbycusis).
That high-pitched “eeeeee” when a TV turned on was real—it came from:
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The flyback transformer
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Magnetic vibration of components during horizontal scanning
Why most adults can’t hear it anymore
As we age:
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The tiny hair cells in the inner ear that detect high frequencies are the first to degrade
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Noise exposure, illness, and genetics accelerate this
By your 60s, hearing 15–16 kHz is uncommon, though not impossible.
So what happened now?
There are a few plausible explanations, and more than one may apply:
1. You briefly heard a modern device producing a similar frequency
Many modern electronics still emit ultrasonic or near-ultrasonic tones, especially:
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Switching power supplies
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LED light drivers
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Phone chargers
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Inverters, UPS units, or solar equipment
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Induction cooktops
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Certain HVAC components
Some of these:
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Start at a higher frequency
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Drift downward as components warm up
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Fade as the circuit stabilizes
That 30-second fade-out strongly suggests an electronic component warming and shifting frequency.
2. Temporary hearing sensitivity change
Your hearing didn’t suddenly “get younger,” but:
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Temporary changes in blood pressure
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Sinus or middle-ear pressure changes
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Fatigue
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Mild inflammation
can briefly make certain frequencies more noticeable.
This is rare but documented.
3. Mild transient tinnitus (less likely, but possible)
Tinnitus is often described as:
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High-pitched
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Steady
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Fading over seconds or minutes
However, tinnitus usually:
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Comes from inside the head
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Isn’t tied to a clear “device turning on” moment
Your description sounds more external than internal.
Why it felt familiar
Your brain recognized the frequency pattern, not the source.
Memory for sound signatures can persist even when we rarely hear them anymore.
When to be concerned
Probably no cause for concern unless:
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This happens repeatedly without any electronics active
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You experience dizziness, hearing loss, or persistent ringing
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The sound becomes unilateral (only one ear)
If that occurs, an audiologist could test your high-frequency thresholds, which might be interesting given your experience.
In short
You likely:
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Briefly heard a modern electronic device emitting a frequency similar to old CRT TVs
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Combined with a momentary window of sensitivity
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And your brain recognized a sound you hadn’t heard in decades
It’s a fascinating reminder that your hearing isn’t gone—it’s just selective now 🙂
If you want, I can help you figure out what device in your home is most likely responsible based on where you were and what was running at the time.

