[R-390] R-390A power switch

[Gordon Hayward]

I use a CL90 with a separate switch in my detector box.
The 390A plugs in after that switch and its own switch
is always on.  I did the same with my FRR-21.
Cheers, Gord  VE3EOS

----- Original Message -----
From: "Chris Farley" <kc9ieq at yahoo.com>
To: r-390 at mailman.qth.net
Sent: Thursday, January 23, 2014 4:29:41 PM
Subject: Re: [R-390] R-390A power switch

Hi all, 


I have been following this with great interest.  I like the snubber idea, but agree there is chance over time for the series capacitor to develop some leakage.  Perhaps using a Y safety capacitor instead of a normal disc ceramic would be beneficial?  Inrush MOV's are good devices too, but don't have the best reliability long-term.  Most if not all suppliers for this switch have dried up.  Using a Triac to power the rig might also be a worthwile consideration, but as another list member pointed out online, it may be an unwanted source of RF noise as well.  Ho hum, what is a boy to do re: saving that daggum power switch.  


Several years ago I purchased one from Fair Radio for $18.27.  Upon checking back, they are long gone.  I was however, able to recently secure the remaining stock from a surplus dealer.  

I do not mean to make this a commercial posting, but if anyone needs one (or a few) of these switches I have a reasonable quantity available.  
$20 shipped for 1, $15/ea for 2 or more for list members.  


Regards, 
Chris 



________________________________
 From: Perry Sandeen <sandeenpa at yahoo.com>
To: "r-390 at mailman.qth.net" <r-390 at mailman.qth.net> 
Sent: Thursday, January 23, 2014 2:36 PM
Subject: [R-390] R-390A power switch
 

All,
 
There have been many postings about avoiding the micro-switch
from welding the points together over the years.  
 
While a snubber network may prevent arcing I think
it may allow some voltage leakage to the transformer while in the off position.
 
My vote goes for using CL 90 or CL 80 input surge
suppressor that has been discussed before.  That’s what I’m using now.
 
Regards,
 
Perrier
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