[Hallicrafters] Inrush current limiters in vacuum tube equipment.

[Roy Morgan]

At 07:12 PM 4/16/2005, Waldo Magnuson wrote:
   by installing an inrush current limiter in series with one or both leads 
of the a-c line input that, the current will ramp up slowly (milliseconds)

Waldo,


It may be longer than milliseconds. The time it takes the inrush limiter to 
heat up will set the time that the voltage applied to the radio rises to 
near normal.  I have not measured that time but it would be good if someone 
did and reported the results.

Do not confuse spike protectors and inrush current limiters.  A spike 
protector conducts when the voltage goes too high.  The inrush current 
limiter is a modest resistance when cold and a low resistance when hot.

The inrush current limiter should be chosen to match the normal current 
drawn by the radio. For this reason it is a good idea to in stall one (you 
only need one, preferably in the hot side of the line after the fuse) in 
each radio you want to protect.

Roy