Although the Sony Watchman eventually fell out of favor when television companies committed to switching their devices to digital signals, you can still make your Watchman work by installing a digital signal converter.

Do old portable TVs still work?

Yes, your analog portable TV can still work if you either get a digital-to-analog converter box or sign up with a subscription service like cable or satellite TV. ... Although you can receive digital broadcasts with an analog TV, thanks to the converter, you may notice that you're not getting full digital quality.

How can I make my analog TV digital?

Ways to Connect an Analog TV in Today's Digital World

If you receive TV programming via antenna, external DTV converter boxes are available that enable using older TVs. Placing the DTV converter box between the antenna and the TV converts incoming DTV/HDTV signals to signals compatible with any analog TV.