DM160 CV6094 INDICATOR VALVE, 1950's
Not actually a Tuning Indicator.
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When conducting the DM160 will give out light and goes dark at cut-off. In this way it can be used to indicate the logic state of the circuit it connects to.
In 1969 Mullard describe the DM160 as: a special quality directly heated sub miniature voltage indicator for use in industrial equipment such as transistorised computers.