Inrush current limiters ( ICLs)

[Greg Gore; WA1KBQ]

I use inrush limiters here on some stuff and in  addition to the soft start 
they reduce line voltage a little also but I  especially like to run all my 
receivers on variacs. I always start them at 100  and increase to 110 after 
a few seconds. I suppose the correct way to do it  would be to measure 
filament voltage and adjust the variac to whatever setting  produces correct 
voltage at the tube filaments for each unit. Some have warned  against using 
variacs due to possibility of an accident but I like them and I am  careful 
with them. Vintage equipment always runs cooler when line voltage is  reduced. 
I have seen cases where a power transformer would get too hot to touch  
after a while on full line voltage but cool off enough to hold your hand on it  
with voltage reduced to 110. The bucking transformer is probably the best 
idea.  Variacs are not isolation transformers.

73, Greg

In a message  dated 6/29/2009 6:21:18 P.M. Atlantic Standard Time, 
radios_r_me at YAHOO.COM  writes:
Bob, I have done it with a lot of mine and I am very pleased with the  
results.
Even in Astron power supplies.

No more scary THUMP sounds  when you turn them on!


73 - Brian "Bry" Carling, AF4K
= =  =
Please use my main e-mail address:   af4k at hotmail.com




________________________________
From:  Bob Jackson <bob at NOFROWNS.NET>
To: BOATANCHORS at LISTS.TEMPE.GOV
Sent:  Monday, June 29, 2009 11:38:42 AM
Subject: Inrush current limiters (  ICLs)

When restoring BAs (or any other vintage radio), is anyone here  installing 
ICLs to protect tube filaments, etc.? I haven't been but am  considering 
using small value thermistors for that purpose. My interests lie  mainly in 
entry-level comm. radios a la Halli S-120 and  similar.

Thanks,

Bob
AG5X

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