Actually, in most if not all of the voltage regulator/voltage reference 
tubes, at least a pair of the pins are used as security feature. This is 
just a short circuit between two pins that are used to disconnect the 
output of the power supply when the regulator is not in the socket to avoid 
unregulated high voltage going into the load when the regulator/reference 
is not in.
It is interesting to see that very few of the new circuits that use this 
voltage regulators do not make use of this security feature.

On Friday, May 18, 2018 at 3:02:32 AM UTC-3, Tomasz Kowalczyk wrote:
>
>
>
> Voltage stabilizers use extra pins just for rigidness of internal 
> structure - they are essentially neon tubes, like nixies, but have larger 
> working areas to support currents varying between 5mA and 30-40mA. So their 
> model has only two electrodes, but as there are more present in the 
> envelope, then why not use them as extra mechanical support.
>

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