[Amps] Soft Start

[Bryan Swadener]

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