I kind of enjoy that green eye winking at me from my halli sx-11.
I have several radios with tuning eyes. I love them.
As far as communications receivers go, I'll have to go with Carl.
We might very well have the meters calibrated to the 50 uv for S9 signals and that in itself
can come in quite handy for providing accurate signal reports.
Tuning eyes, on the other hand, provide a "maximum" signal strength and can come in quite handy for tuning a broadcast signal and they are pretty 30's and 40's retro.
One thing not covered is using them as a modulation indicator.
I have plans to put one together for my AM transmitter. Calibration is a snap and the winking eye can identify hum as well as max modulation. Heck, you could even have a bank of them to show different audio frequencies while modulating.
The circuit is so simple and easy to build it could be considered an afternoon job.
Now.....where can I find escutcheons for the eye that aren't made of plastic.