Good old Glen, a day late again!
----- Original Message -----
From: "Glen Zook" <gzook@yahoo.com>
To: <amps@contesting.com>; "Kathy Bookmiller" <wb2aio@yahoo.com>
Sent: Thursday, March 24, 2011 4:13 PM
Subject: Re: [Amps] SB 200 blown diodes in power supply
> Replace the diodes with 1N5408 which are cheap from Mouser and have a much
> better safety level than the original diodes. Mouser does not have a
> minimum order.
>
> http://www.mouser.com
>
> You will have to increase the size of the holes in the existing circuit
> board to accommodate the larger diameter leads of the 1N5408.
>
> However, you need to determine why the diodes "went". Probably due to
> failing electrolytic capacitors. You can get suitable capacitors from
> Mouser at reasonable costs.
>
> Glen, K9STH
>
> Website: http://k9sth.com
>
>
> --- On Thu, 3/24/11, Kathy Bookmiller <wb2aio@yahoo.com> wrote:
>
> I know many of you probably consider a SB200 as a driver for your real
> amps, but for us QRPers, it is as good as it gets:) I just blew a diode in
> HV chain. Now one friend I respect says I should put in the Harbough
> board, soft start, etc. Trouble is, that's money I don't wish to spend if
> I don't have to. Put in new board is easy to say when you have money, but
> us poor underpaid nurses.... Taking a look at mine, I noticed there are 3
> diodes already replaced in the two strings by placing them under neath or
> on the bottom of the board. When I first looked at it, I thought they had
> been vaporized:), so this isn't a new problem. I'm hoping to find
> something at Radio Shack I could use and just change out the newly blown
> diode, maybe even using the trick the previous owner employed of just
> putting in the new one underneath to save taking it apart to get at the
> top of the board. So was wondering what you guys think or your experiences
> with the SB200. I just
> acquired it last summer and otherwise has worked really well when I've
> needed it.
>
>
>
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