[R-390] Selenium Rectifier

[David C. Hallam]

I agree. Selenium rectifiers are one replacement part we are better off
without.  As soon as silicon diode rectifier design became available, parts
manufacturers dumped selenium rectifiers and for good reason.

David
KC2JD

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Barry Hauser
Sent: Tuesday, November 15, 2005 5:28 PM
To: DW Holtman; R-390 at mailman.qth.net
Subject: Re: [R-390] Selenium Rectifier


Hi DW

All you'll find are NOS or pulls from chassis and it's best not to rely on
them.  I think most would agree, it's OK if the SS bridge is visible -- you
have to peek down the back with the cover off -- and that's downright nosey.
Even if seen, it shows you care. ;-)

I haven't had any seleniums fail lately, but one did when I was merely a
child back in the late 50's -- in a Motorola TV.  The smoke and acrid stink
left quite an impression. (If I think about it real hard, I could make
myself choke.)  When my uncle visited, he replaced it with the latest
thing -- a tiny, shiney, "top hat" silicon rectifier.

It's customary to leave the Se rectifier in place and mount the solid state
replacement nearby.  SOP around here.  They're still pretty, brightly
colored and be-finned, yet safe if not in the circuit.

Barry

----- Original Message -----
From: "DW Holtman" <future212 at comcast.net>
To: <R-390 at mailman.qth.net>
Sent: Tuesday, November 15, 2005 5:10 PM
Subject: [R-390] Selenium Rectifier


> Hello,
>
> Does anyone know where I might buy a Selenium Rectifier for the chassis of
> a R-390A, CR-102. I have replaced it with a solid state bridge for now,
> but would very much like to get something more original in the chassis.  I
> could not figure out a clever way to hide the diodes inside the selenium
> fins.
>
> Thank you for your time.
>
> 73's
> DW Holtman
> WB7SSN
>
>
> Selenium
>
>
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