Before revision: Other applications Magic eye tubes were used as the recording level indicator for tape recorders (for example in the ), and it is also possible to use them (in a specially adapted circuit) as a means of rough frequency comparison as a simpler alternative to Lissajous figures.
After revision: Album art for Circuital, featuring a magic eye tubeOther applications Magic eye tubes were used as the recording level indicator for tape recorders (for example in the ), and it is also possible to use them (in a specially adapted circuit) as a means of rough frequency comparison as a simpler alternative to Lissajous figures.