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Once upon a time (1972) Heathkit produced a high end solid state tuner when SS was new. It was one of the first with a microcontroller controlling a precision oscillator and got high marks for it's reception and fidelity.
It used these numitron tubes to display the frequency.
Look up Heathkit AJ1510 and you can see them. The numitrons look neat but they are just low brightness bulb filaments and burn out after time.
I have one and had to replace a couple of the tubes.
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