The KSC clock might just use fluroscent tubes in a 7 segment display configuration.Pretty easy to do, just put a set of relay contacts inplace of the starter in the circuit, close the contact, fluro turns off, current flows through heater / filiment keeping them warm.Open the contact, fluro lights..Drive relays off bcd to seven segment decoders, etcWhile it's a bit nasty on the fluro tubes when in the off condition, they are cheap..and the duty cycle isnt all that bad.In actual practise, the relays suffer more than the tubes, and they are cheap too! Blair South Australia
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