FWIW, Mike WØBTU put this together, s'plaining the "Miller-Larson Effect":
http://www.w0btu.com/miller-larson_effect.html.
Though, in some cases (such as in the SB-220), there's little/no benefit,
as the filament transformer limits the current. In those cases, you're
mainly extending the life of the ON/OFF switch from yuuuge inrush current
caused by overly large HV filter capacitance.
vy 73,
Bryan WA7PRC
Date: Wed, 27 Dec 2017 06:25:27 -0600
From: Jim W7RY
Subject: Re: [Amps] Soft Start
Soft start (I call it step start) does reduce filament inrush current. As
long as it's on the filament transformer primary.
Which it is in the SB200, SB220, TL922, L4B and TenTec Titan... And many
others.
73
Jim W7RY
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