David, I've deleted the emails on the switchmode filament supply thread
but here is some info which may or may not be helpful.
Go to http://f1frv.free.fr/
Scroll down to AMPLIFIERS SLOW RISE HEATER REGULATED SUPPLY
<http://f1frv.free.fr/main1f_Soft_Start.html>
73, Alek
VK6APK
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http://www.qrz.com/db/vk6ap
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