On-screen tuning bar - '81 Sylvania 9" - Neat!

[loomis]

I have never seen a television with this "electronic tuning" feature before.

You turn the tuner knob, and a vertical line appears on the tube, which you line up with vhf/uhf numbers to tune in a channel. The line is blue for uhf, and green for vhf. After a station is tuned in, the line fades away.

At first I thought something was wrong with the tube, because it had a line running through it. Sometimes the vhf line turns into a white/black/green line, although I don't quite understand how you use these lines to tune in a station, and why only vhf has the multiple lines.

Ever seen one before? This little Sylvania was made in 1981. Model czb101sl. It's in great shape, and plays great.

Tune up tips? Replace all the capacitors when I get board? Thanks.