Quote:
Originally Posted by idiotbox
I've got a couple B&W TV's from the 1970s that as soon as I turn them on, emit a painfully high pitched and loud hum. They are a 1975 Quasar and a JVC Model 3240 Videosphere. Is this normal and is there anything I can do to stop/reduce the hum? I have the ears of a dog so maybe others haven't noticed this. It's gotten to the point where I can't be in the same room as the TVs because it is so uncomfortable (which really takes the fun out of putting them to use). I have no clue what exactly causes the hum, but even with the volume all the way down the hum doesn't change. Thanks in advance. |
It is the 15.734 kHz horizontal sweep rate inherent in NTSC displays. I share your pain. In grade school I could hear a TV left on from 3 rooms down the hall with the doors open. Even as an adult my hearing still goes up around 17kHz according to the last occupational hearing evaluation I had in 2012.
Or are you experiencing a low frequency hum in the audio circuit? That can usually be fixed, unlike the 15.734 kHz whine.