Magic Eye Indicator Tubes from Left to Right:
EM81
EM71
DM71
EM84
EAM86
10M2
6E5D
6T5
A timer cutoff circuit is incorporated into this display to turn off power for the vacuum tubes to conserve their useful life. Bluetooth will continue playing through the speakers.
My favorite magic eye tube was a tiny one that looked like an exclamation point (don't remember the designation). The vertical bar got shorter with stronger signal. I used one as the dial pointer on an FM tuner i built.