[Boatanchors] Relay Repair - Demagnetization Question

WA5CAB at cs.com WA5CAB at cs.com
Wed Feb 3 11:23:43 EST 2010


If your method works well for you I wouldn't change it.  But the method I 
described also came from the vintage car people and has worked well for me.  
In the self-rectifying circuits, the contacts in the secondary are switching 
anywhere up to about 550 volts, depending upon the supply.  

You're right about the 115 cps.  I forgot about them last night.  In most 
of the 30's and 40's supplies I work on, 100 cps is common but most of the 
50's vintage run at 115.  A few are faster.

In a message dated 2/3/2010 8:38:05 AM Central Standard Time, 
km1h at jeremy.mv.com writes: 
> I just dont care for that much voltage to clean the contacts; the idea is 
> to 
> use just enough to remove the oxide without leaving pitting. Its 
> comparable 
> to using a burnishing tool versus a points file.
> 
> There are a couple of methods used or championed by the vintage car people 
> 
> and Ive been happy with the one I use for many decades.
> 
> Most auto vibrators run at 115 cps and there is a fairly even distribution 
> 
> between 6V and 12V radios arriving here. The big rush to 12V systems 
> started 
> in 53.
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480


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