[R-390] Selenium Rectifier

[Tom Norris]

Not sure I've seen a catastrophic failure in *most* of the equipment  
I've
had that had selenium rectifiers.

When they've died, they've just... opened up or become a resistor.

I count myself lucky, I think.

Tom

"No Keilbasa Ballasts"

On Nov 16, 2005, at 4:34 PM, Don Reaves W5OR wrote:

> I don't recall anyone ever reporting a catastrophic failure of this
> rectifier.  Anyone?
>
> About two years listmember K2CBY posted this:
> -----
> I had the selenium rectifier fail one leg to open on my Motorola  
> Contract
> 363-PH-54 chassis about 10 years ago. No short, no smoke, no smell.  
> The
> symptom was a very loud buzz from the antenna relay and a failure  
> to pull in
> completely when the FUNCTION was switched to CAL. I assume the same  
> symptom
> would appear if BREAK IN was enabled and the ptt line grounded. The  
> symptoms
> of a failed selenium rectifier are so obvious and it is so easy to  
> get to
> that I wouldn't bother with pre-emptive replacement.
> Miles, K2CBY, Sag Harbor, NY
> -----
>
> Anyway, along with not eating R-390 meters (ala Roy Morgan), you  
> shouldn't
> be grinding up used selenium rectifiers as dietary supplements (ala  
> Barry
> Hauser).
>
> Don
>
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