[GreenKeys] Mystery rectifier

[Steve Garrison]

I have several selenium stack rectifiers that have been working for years.

I suggest taking it outside then applying power via a variac. 

If no stinky magic smoke is released, then go for it.

Steve G./N4TTY
Sent from my iPhone

> On Nov 15, 2018, at 3:42 PM, W9DDD <w9ddd at tapr.org> wrote:
> 
> You guys, gave me some good laughs.  I'm old enough remember the stench of a both failures.  Letting the smoke out of the newer stuff just doesn't compare.
> 
> The base plate has a wrinkle green paint that doesn't quite match the Teletype GA finish.  So I don't think it was home brew.  I didn't notice a name plate, but the mission was getting the RO going and it was just in the way.  The RO received a test message via a Volpe board from a laptop. So that ended the restore session for the day.
> 
> That transformer looks big enough to supply 400=500 ma at 120VDC, so saving that is probably worth while.
> 
> John, W9DDD
> 
>> On 11/15/2018 12:55 PM, groupsrichart at gmail.com wrote:
>> Looks like a homebrew loop power supply. The electrolytic caps are probably toast and those selenium rectifiers are really nasty when they fail. The only things worth salvaging are the power transformer and the wirewound resistor with the sliding tap that was used to set the loop current.
>> Tim WS4V
>>> On 11/15/2018 1:45 PM, W9DDD wrote:
>>> Anyone recognize this?  Kind of WU flavor?
>>> 
>>> https://www.tapr.org/images/mystery-ps-sm.jpg
>>> 
>>> Probably goes to land fill unless someone has a need.  Was bolted in the bottom of 28KSR cabinet but wasn't "active".  No other indications of WU on this RO.
>>> 
>>> One of the other KSRs has a WU ESU, any pointers for a WD on it? Haven't dug into this one far enough to look for name plates.
>>> 
>>> 
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