The CV2980 is a miniature tuning indicator designed for dry battery operation. The display changes from minimum to maximum for a 10 Volt change on the control grid.
It will be seen that the lettering has been printed over the display opening.
The two electrodes with the filament wire seen at the bottom and the support at the top. The sloping electrode carries the green phosphor.
A clearer view of the filament and keyhole window to the anode below.
A slightly enhanced view.
The thin glass tube envelope is 10 mm in diameter and, excluding the B8D base wires is 43 mm tall.
