Quote:
Originally Posted by bandersen
and eliminate that 20W filament dropping resistor.
My hope is that the CL-90 will provide a soft start but not restrict the current too much. I have a CL80 and CL-130 I can experiment with too.
Perhaps I should use a diode that can handle more current ? The surge might be too much for a 1A 1N4007.
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The 1N4007 will be fine. Silicon diodes can take a brief surge higher than their average current rating. You'll have to look at the brightness of the heaters in the tubes to see if they look to be the right level, as a voltmeter won't give a meaningful number (though a true RMS meter might).