** Other disadvantages are that 50 or 60 Hz is too fast of a ramp-up for
capacitor filter HV supplies and for thoriated-tungaten
filament/cathodes. However for heater-type cathodes using a
resonant-choke HV supply, zero-crossing switches should be OK after
suitable RFI filters have been installed. To my way of thinking, a
conventional one resistor and one SPST DC-coil relay stepstart is a less
problematic, albeit less-elegant, solution.
>LX2KL's web page has a some good information on the different commercial
>zero crossing step start systems. One disadvantage is that they need RF
>suppression filters.
>
>
>http://www.kristronic.com/index.html
>
>Craig
>VK3HE
>
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>
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