I have a 26"/66cm 16:9 LG Flatron TV to dispose of free for anyone who wants to come and get it. Colour is silver grey.

It is in good working order except for two things:

-never have been able to get the Y Pb Pr video input to work, though this could just be a matter of the right settings. Tried several times but never succeeded. Other video and audio inputs OK. Needs a HD set top box for HD.

-according to the younger members of the family puts out a shrill whistle. I can only hear this with my ear against the louvres at the back.

As I said, otherwise in good working order and still used regularly as a second set but is to give way to a flat screen.

Hardly vintage but a good example of the pinnacle of reasonably priced tube TVs and good for watching football or cricket in the company of true vintage TVs. Otherwise goes to the dump.

-according to the younger members of the family puts out a shrill whistle.

I've always been able to hear ultrasonic squeals from television triplers and also from SCRs and triacs under heavy load.

Most people can't hear these sounds, probably because they are outside the normal human hearing range.

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A valve a day keeps the transistor away...

I've always been able to hear ultrasonic squeals

By definition, the ultrasonic range is inaudible to human ears.

I can hear high frequency squeals from my NEC television under certain operating conditions whereas some other adults cannot, but children can.

I suspect these squeals are either nudging the ultrasonic band or I may be detecting harmonics of them.

The set has not always made the whistle. So I guess a transformer somewhere has loosened up a bit. I have fixed mains transformers with a buzz by running superglue into the laminations. No idea if this is appropriate for this case as high frequency cores are ferrite, but probably not....

Where are you?

Wollongong area

"I've always been able to hear ultrasonic squeals from television triplers"

Me too. When I was young, friends used to think I was mad, lying or (if lucky) psychic when I could hear from the street if a TV was running inside a house we were walking past.

I also hear the low-frequency rumble of the garbage trucks a couple of streets away, in time to run out with the bin if I have forgotten it.

A lot of hearing is in fact a learned cognitive processing of a neural stimulus. Like other animals, we tune in or out to frequencies or patterns of sound waves that are useful to our survival - in effect, not unlike the electronic tuning of radio waves.

My grandmother lived next to a railway line and never "heard" the trains, though she had a keen ear for music and for birdsongs. Mothers hear their own baby through the cacophony of a nursery full of wailing infants.

Recently I've had some tinnitus issues, including increased perception of high-frequency whines which may nor may not be artifacts of ambient electronic equipment noise. The only cure is training yourself to tune out - and it works.

People with an attenuated hearing frequency range, or a heavier psychological filtering habit, often don't believe that others can hear more.

Maven

Forgot to put in the model no which is RT28FZ10RX, and the same as this listing on ebay

http://www.ebay.com.au/itm/LG....

And not to forget that high frequency response drops in most adults by around age 40 therefore making it hard to hear the 15625Hz wine from horizontal output stages. I remember as an apprentice my 45 year old boss not being able to hear the HO fire up, whereas I as a 16 year old had no trouble. These days I'm like the boss! - can't hear it any more.

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Robert

There are lots of sites offering online hearing tests, like this one:

http://www.audiocheck.net/testtones_hearingtestaudiogram.php.

QUOTE: high frequency response drops in most adults by around age 40

In the '80s I built EA's 200 watt PLaymaster amplifier - very good low noise design for the time. Only a faint hiss was audible at high volume. Then a four lane express-way was opened 50 metres away. All of a sudden the faint hiss was no longer an issue!

Now 25 years later have moved to a much quieter location and the hiss is still no longer an issue but for a different reason!