When recording the signal starts out great but then gets very quiet, sometimes there's a high pitch frequency too. Any ideas? It's 2nd hand but has been working fine for over 3 years.

I've had variable track lighting cause a similar problem and only with analog sources. Is it only with track lights on?

A high-pitch squeal is common in CRT TV sets and monitors. I've never run across this in an LCD monitor, but there's a first time for everything. If the sound isn't coming through built-in speakers (if this model has them) and is being caused by the computer, I would suspect the inverter circuitry. This provides power for the backlight, and there are transformers that may have become noisy. Because of their construction, it's possible for them to vibrate internally, and at a frequency that you hear as the high-pitched noise. There isn't a lot you can do to quiet them. When I worked on TV sets, I had mixed success using hot-melt glue to muffle the noise, but usually the only way to completely cure the problem was to replace the parts. It's unlikely you'll find the parts available for a monitor, so all I can suggest is to bear with the noise as long as the monitor is otherwise working properly. Or use this as an excuse to buy a new LCD monitor; they are quite reasonably priced these days.

Check your power supply to the unit. Low voltage COULD cause this.

Also make sure a setting is not "looping" the audio back into itself.

Hello,if your computer is old and the noise is low frequency but very disturbing and sometimes gets louder and then lows then is your power supply and you must change it.If the noise is more high pitch and it doesn't change frequency then should be the graphic card.If its like scratching noise is the hard drive.You must figure out exactly where the noise is coming from before replace anything

Your capsule is gone, sorry. I've owned 2 NT2s that I bought over 5 years ago. Eventually the capsule goes and that was what happened to mine: "started working-got quiet-unwanted noise"
The first time it happened Rode replaced my capsule for a $50 flat rate repair fee (capsules are $300..what a great co.)
However I recently contacted them about the second one and they no longer have replacement parts.
They did offer to give me a discount on a new mic if I sent the broken NT2 to them for parts.
It's too bad...I love those mics.

This sounds like a difference in the sampling frequency.  Music recorded at 48Khz must be played back at that frequency or there will be a significant difference in speed and pitch during playback at 44.1Khz. I first noticed this when it occurred to me when recording on digital audio tape.  Ipods and minidiscs and mp3 recorders can record at high sampling frequencies like 48K.  Cds are all recorded at the standard 44.1K sampling frequency.   Check the source of your recordings and it should follow a pattern that leads to your current results.       I do not have enough information  on how your music was transferred to tell you more at this time, but I am very confident that differences in sampling frequencies of your source material are causing the pitch differences you are hearing.   Without knowing exactly the sampling frequencies of each piece of equipment you used to record these songs it will be next to impossible to give you a very specific solution, so I hope the info. I have shared helps you to figure it out.  Best regards and good luck!   Michael Mittelsdorf

I have the Sony Bravia KDL-46S4100. The high-picthed hiss drives me insane. I have a work around but not a fix. Go into your TV's menu and find BACKLIGHT. Adjust it from 1-9 with the house quiet and find what frequency of the hiss is the least annoying.


Sony Bravia high pitch hiss hissing sound high frequency

most likely it is the flyback transformer. I have had meny RCA tv's with a bad Flyback and H.O.T transistor bad. Cost depends on the service center. Parts average around $60.00 dealer, so depending on mark up and shop labor it could vary greatly. If you have never changed these parts it is best to have a service man do it ... Take it to the shop and save the trip call charge $49.00 and up to $125.00..

Call tech support! That's why these people get paid. Sites like this wouldn't need to exist if they did their jobs correctly!

The high pitch squeal you hear is usually caused by a coil vibrating, normally in the horizontal circuit. I've also seen the ferrite bead on the horizontal output transistor do this, but, it is rare. I normally will repair this by finding the coil and "tightening" it. To tighten a coil, technicians use different chemicals, such as, a hot glue gun, rubber silicone or even finger nail polish. I will find the coil that screams by starting with the usual suspects and using a wooden dowel, barely touch the coil and if the pitch of the noise changes, then, thats the coil that needs repaired. If you do not know your way around the inside of a television, I never recommend you do so, since, this procedure must be done with the set turned on and you poke your hands around the inside of the set by the high voltage circuit. Hope this helps your decision.