[Heathkit] HP23A Power Supply Diodes

[Ken Winterling]

Jim,

I agree and use the 1N5408 when there is room. Sometimes there is an issue
when replacing PCB-mounted diodes. You may have to enlarge the through
holes a bit due to the larger diameter leads of the 1N5408 vs the IN4007.
A 1N5399 is 1KV @ 1.5A and is a good choice when a 1N5408 will not
physically fit. It is the same size as a 1N4007.

Ken
WA2LBI





On Mon, Oct 26, 2020 at 9:21 PM Jim Shorney <jshorney at inebraska.com> wrote:

>
> 1N4007 would be a good choice, but the 1N5408 is a higher current device
> for not much more money. Thy are a very robust diode and are my preferred
> choice when replacing 1N4000-series diodes in power supplies. Cheap enough
> at Mouser that I buy in bulk.
>
> 73
>
> -Jim
> NU0C
>
> On Mon, 26 Oct 2020 09:53:29 -0700
> "David Thorne" <thornedw at gmail.com> wrote:
>
> > Jim,
> > Perhaps you already have this but if not it will be helpful, although it
> > recommends different diodes than does Jim Shorney, NU0C:
> > http://www.rdfproducts.com/vr_apl_001.pdf
> >
> > Dave
> > K7KTB
> > -----Original Message-----
> > From: heathkit-bounces at mailman.qth.net
> > [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Jim Shorney
> > Sent: Sunday, October 25, 2020 11:20 AM
> > To: heathkit at mailman.qth.net
> > Subject: Re: [Heathkit] HP23A Power Supply Diodes
> >
> >
> > Go with 1N5408. You will likely never need to replace them again.
> >
> > 73
> >
> > -Jim
> > NU0C
> >
> >
> > On Sun, 25 Oct 2020 14:12:53 -0400
> > Jim <jim at w1jt.net> wrote:
> >
> > > Hello all,
> > >
> > > I came across an old HP23A that was in really bad shape.   It was
> > > literally covered in mud.  I don't know how  that happens but I guess
> > > it does.
> > >
> > > Anyway, I thoroughly cleaned it, completely disassembled it and now
> > > I'm in the process of rebuilding it.
> > >
> > > The parts list calls for 7 silicon diodes.   It doesn't however, give
> > > any specifications.   I'm wondering if any of you fine folks know what
> > > diodes I should purchase?
> > >
> > > Thanks in advance.
> > >
> > > Jim W1JT
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