[Milsurplus] Copper oxide rectifiers

[hwhall at compuserve.com]

This sounds like good news. They appear like brand new except for where the mounting studs appear on the topside of the chassis, they are rusty there. When I get to that part of the project, I'll remove them and give them a test to see if we can keep them in use.

Many thanks!
 

 Wayne
WB4OGM



-----Original Message-----
From: Bruce Gentry <ka2ivy at verizon.net>
To: Milsurplus <Milsurplus at mailman.qth.net>
Sent: Tue, Aug 20, 2013 7:28 pm
Subject: Re: [Milsurplus] Copper oxide rectifiers

 
 
 
Copper oxide rectifiers are unusually durable as long as they don't get  
wet or reside in extreme humidity. They are less efficient than selenium  
or silicon, but very tolerant with regard to transients. If they don't  
show signs of corrosion, peeling paint, or overheating at the center,   
raise the AC  voltage on them gradually to check them out. A little rust  
on the fins isn't a problem as long as the wafers and discs at the  
center remain sealed with the varnish or paint. The fins are for cooling  
only, the copper oxide is on washers at the center, unlike a selenium  
rectifier where the selenium is spead over one side of the the entire  
plate.  I put many of them back in service in elevator controllers that  
had been idle for many years, and they rarely failed. 
 
     Bruce Gentry, KA2IVY 
 
 
On 8/20/13 9:10 PM, hwhall at compuserve.com wrote: 
>   Does anyone have experience with copper oxide rectifier stacks? I'm helping  
with a Link Trainer restoration project for a local museum and there are two  
such in the instructor's control chassis. Approx 1940s vintage. Do these things  
fail easily or might these be usable still? 
> 
> 
> Thanks! 
> 
> Wayne 
> WB4OGM 
> 
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