New room mate hears my tv

[lnx64]

So I moved out of home with my father. I moved in with a friend. But here's a problem, she is apparently able to hear a very high pitched sound even with the volume down. I can't hear a damn thing but apparently it's so loud she can't sleep at night and says its nearly deafening.

I'm afraid to think she's just hearing stuff but I really do feel she hears a high pitched sound from my tv.

Is this a problem with the TV? I swear I hear nothing at all. But she did know I just turned on the TV because she commented on it before I mentioned I turned it on.

[David Roper]

Sensitive ears on that one. I suspect it's what the Brits call "line whistle" and it comes from the flyback. I could hear it when I was young; once while on a vacation trip with the family, walking through a mall, I said "oh, we're coming up to the TV section!" I got some doubtful looks, but after a few more steps and turning a corner, voila, rows and rows of TVs.

Unlike your friend I was never bothered by the sound of a flyback. The pitch is way too high to be perceived as having much volume at all. Not sure what you can do to accommodate her other than turn it off at night go flat screen.

[Electronic M]

Yeah it is almost certainly the horizontal section she is hearing. I'm 21 and my hearing has not aged out of hearing frequencies as high as the 15,734Hz of the horizontal sections of my sets. My tube sets tend not to be bad enough to notice(ie I can hear it but my brain just tunes it out) most of the time, but it varies from set to set.
Worst set I ever had in the whistle department was a 2003 Sharp BPC set...Most annoying part was that the volume of the whistle was intermittent. It would be too quiet to notice one minute and hear it throughout the house loud the next.

[lnx64]

We both are in our mid 20s. My hearing must be going because it's bad enough I keep saying "what?" to her.

Ugh guess I need an LCD for at night. But I love this CRT so much.

[DavGoodlin]

Maybe pushing toothpicks into the flyback gaps between core and donut will help.

I have also noticed the halves of flyback cores sometimes have tiny squares of rubber where they butt together.

The RCA sets of the early 80s had this issue occasionally and we would disassemble the flyback core to add or replace these rubber pieces, often with fiberglass tape. Sometimes just tightening the nuts on the core retainer "spring-hoop" would eliminate the squeal.

BTW, I have not heard this sound from just a TV anymore, I have near-constant ringing in my ears and hear it all the time

[lnx64]

It's a brand new HR Diemen flyback. It's enclosed so I can't access the insides.

[Ed in Tx]

I remember when I could hear the 15,750 Hz from TVs, some were worse than others, and I could hear "ultrasonic" alarm systems up around 22kHz. when I would go in to certain retail stores, back when I was a teenager and early 20s. Just need exposure to loud music and high frequency test tones for a few years to drop that hearing range down to 10-12 kHz and no problem!

[zeno]

I cant hear them unless they are REAL loud. Woman seem
to be much more sensitive to it than men. Almost all
the complaint I had were from women.
Use a paper towel tube to locate the problem. Use a plastic
poker to move & push on things. The FBT may be vibrating
against the PCB but its prob. the FBT itself. It can also
come from pin circuits, switching power supplies, coils
in the yoke curcuit etc.

good luck Zeno

[lnx64]

I don't know. I don't think i can fix an audible problem I can't hear. I guess I can take apart my tv and start poking stuff while she listens. But lol attention span could be a problem too.

[Chip Chester]

There are many apps and programs out there for phones and PCs that will pick that up... Google up spectrum analyzers and look at their frequency response in relation to the mic you'll be using in your phone or PC.

High frequencies are very directional, and also pretty easy to stop. Scrounge up some sonex/sound "tiles" (not acoustical tiles) and experiment with placement once you can see the frequency with your analyzer. If it emits basically from the front of the TV, maybe arrange things so that the TV points at a sound treated wall, while pointing away from the path to her ears. If she's watching the TV.... well, can't help you there.

Don't overlook that she may be hearing it through some other electronic device, that it's bleeding into. Maybe take a quiet day and turn off and unplug absolutely everything, then re-start one at a time.

I have trouble with multiple switching power supplies... and there must be 50 surrounding me in my office. Some day I'll attack that problem...

Chip

[lnx64]

Well most I can do is get an audio recording. It's amplified my TV isn't normally humming this loudly.

http://www.mediafire.com/?wl3bb2448volts6

Can anyone else here the high pitched squeal she hears? Even in this recording I do NOT hear it. (She's not home to tell me if my microphone picked it up or not).

[compu_85]

I can hear it... same high pitched sound I can hear from any CRT type TV.

-J

[lnx64]

Only sound I can hear is the flybacks "ticktickticktick" sounds, and the IF buzz. That's it..

I just can't hear it at all I guess..

[dieseljeep]

Originally Posted by compu_85

I can hear it... same high pitched sound I can hear from any CRT type TV.

-J

I used to be able to hear it, 40 years ago.
After 38 years of working in noisy factories, my high frequency hearing is just about gone.
When the all solid state sets were first coming out, there was a lot of complaints about high pitched sounds. The manufacturers were recommending applying silicone sealant to even the ferrite beads, used in the flyback derived supply circuits.

[CoogarXR]

When I was young, my sister had a TV that squealed in such a way that only I could hear it. It was rather painful, heh. Now that I am older, I don't know if I just don't hear that well anymore, or if I just haven't been around another TV that squealed like that. Either way, I haven't heard that sound in ages, but I know what your roommate means.

I wonder if dogs hear it...