Happy new year to all the amplifier builders and experimenters with
higher power RF here.
When I designed step start for commercial transmitters i used a clamp
on Fluke current transformer, and connected it to a scope. There I
could see the momentary inrush current scaled by 100 or 1000. As long
as the CT wasn't saturated this worked well.
When I step start modified my SB220 years back, I just used low
value Resistors and noted that the plate voltage comes on for a
fraction of a second at lower voltage before kicking up to max. The
resistors didn't feel warm afterwards, so I believe it worked fine.
john
K5PRO
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