Agreed Jim! 3 amp diodes are an overkill on the SB-200 and SB-220.
73
Jim W7RY
--------------------------------------------------
From: "Jim Garland" <4cx250b@muohio.edu>
Sent: Saturday, March 26, 2011 6:24 AM
To: <amps@contesting.com>
Subject: Re: [Amps] SB-200 power supply diodes
> Kathy,
> I'd advise replacing the diode string in your SB-200 with 1N4007 diodes
> instead of 1N5408. Not that there's anything wrong with the 1N5408, but
> the
> holes in the circuit board will have to be drilled out to make them fit.
> The
> 1N4007 will be a perfect fit, and with a 1A/1000V rating, will be more
> than
> adequate for an SB-200. You should probably also replace the elderly
> electrolytics in the amplifier while you have it apart.
> 73,
> Jim W8ZR
>
>> From: Kathy Bookmiller <wb2aio@yahoo.com>
>> Subject: [Amps] SB200 diodes
>> To: amps@contesting.com
>> Message-ID: <795630.36304.qm@web59714.mail.ac4.yahoo.com>
>> Content-Type: text/plain; charset=iso-8859-1
>>
>> Thanks to everyone for their replies. I'm going to order them from Mouser
> and replace them
>> all as that is the consensus of the replies I received both on-list and
> off. Did take a run over
>> to my local RS store and they had some that were close to the 1n5408s in
> spec, but only a 3
>> pack of them, so will order them all from Mouser.? That seems to be the
> norm for RS. It
>> seems about every time I go in there for some parts, they'll have them in
> those drawers in
>> the back, but only one or none is inside the compartment.
>> While waiting for them to show, maybe I'll finally get into my old
>> NCL2000
> that is loosing
>> it's drive and has been sitting on the repair bench for a year:) That is
> how I ended up buying
>> the SB200 when it showed up on Craigslist here last summer, while waiting
> for a new set of
>> tubes to show up.
>> So I'll spend the weekend looking for the odd band fill in the WPX
>> contest
> and checking the
>> capacitors in the SB200 and cleaning off the board of the old diodes.
>> 73,
>> Kathy
> *************
>
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