[Boatanchors] selenium rectifier replacement

[Dick KF4NS]

Oh, dear God, I finally have gotten so old I forgot simple pie chart 
formulae! Thanks John. Not only did I mess that up but after you set me 
straight,  I was figuring the DCV at the diode rather than the drop across 
the R. When I have a brain short circuit I really do it big! hi,hi. Makes me 
wonder how I ever got my licenses (ham and radiotelephone).
73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "WB6BLV" <wb6blv at inreach.com>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Sent: Tuesday, January 30, 2007 1:13 PM
Subject: Re: [Boatanchors] selenium rectifier replacement


> You do NOT need a 12.5 watt resistor!  The 125 volts is not across the
> resistor.  The resistor power rating is going to be the resistance times 
> the
> square of the maximum current it must pass.  In this case you have 50 X 
> 0.1
> X 0.1  which equals 1/2 watt.  Use a 1 watt to be on the safe side.
>
> I recently came across a stack of NOS selemiums that I have found to work
> well, though obviously less efficient than a silicon unit.
>
> John
> WB6BLV at inreach.com
>