[R-390] Re: R-390 Digest, Vol 19, Issue 39

[rdavis7]

Selenium failure---Yep,for sure. I have one right now in my R 390. Antenna 
relay sounds like a door buzzer. Receiver hasn't been used for 15 years and 
this happened after I replaced the caps for initial start-up. Anybody want 
the culprit to play with? First reply gets the prize! Rick K8PJQ
----- Original Message ----- 
From: <r-390-request at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Thursday, November 17, 2005 4:01 AM
Subject: R-390 Digest, Vol 19, Issue 39


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> Today's Topics:
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>   1. RE: Selenium Rectifier (Glenn Little WB4UIV)
>   2. Re: Selenium Rectifier (Tom Norris)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 16 Nov 2005 19:51:09 -0500
> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> Subject: RE: [R-390] Selenium Rectifier
> To: <R-390 at mailman.qth.net>
> Message-ID: <6.1.0.6.2.20051116194837.055a39d0 at mail.bellsouth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
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> When you remove them from the equipment, disassemble the stack. Plates the
> plates in lacquer thinner. Remove the paint then attach a wire to both
> sides (one wire per side). Use tape or conductive epoxy. You now have a
> photo cell.
>
> 73
> Glenn
> WB4UIV
>
> At 07:49 PM 11/16/05, Dave Maples wrote:
>>Boy howdy, I sure agree with getting rid of these things.
>>
>>If you really want to use the selenium rectifier, maybe you grind it up 
>>and
>>put it in hair soap and call it SelSun BLEW (snicker).
>>
>>Dave Maples
>>
>>
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>
> ------------------------------
>
> Message: 2
> Date: Wed, 16 Nov 2005 19:10:10 -0600
> From: Tom Norris <r390a at bellsouth.net>
> Subject: Re: [R-390] Selenium Rectifier
> To: r-390 at mailman.qth.net
> Message-ID: <F04A33E2-7387-463B-86B5-7C7C8EC374F8 at bellsouth.net>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> 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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> End of R-390 Digest, Vol 19, Issue 39
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