[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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