HP-23 recap

[Charles W. Morehouse]

Folks,
There are two schools of thought here. The first is to use the cheapest part
you can find,
mount it any way you can and get it out the door. As long as it doesn't blow
up before the warranty runs out. I fear you are from that school.
As an RF design engineer at the Cape, I designed a lot of the communications
checkout equipment used on the orbiter. I always used the best components
that I could find.
That equipment is still in use today. Now retired I have a lot of fun
restoring the lovely old ladies and my goals are the same. Use the best
parts you can find, and try to keep the look of the unit the same. Might
cost a bit more but I want my restorations working for future generations. A
little money up front is well worth it. That is my school and will stay in
it. If you are going to do the job, do it right the first time. I hate to
clean up a mess left by some hammer mechanic.
Wayne;
W4GBW

Glen Zook wrote:

> You can do as Stu suggested, or, there is plenty of
> room under the chassis to mount the capacitors by
> soldering the pins directly to a terminal strips, etc.
>  When you mount them under the chassis, it does look a
> bit better than when you support them from the
> existing clips.
>
> These new capacitors are only 25 mm diameter by 30 mm
> long (or about 1 inch in diameter by 1 3/16 inches
> long).  They have the volume of about 1/6 the
> original.
>
> You can "cover" the original mounting holes with
> either a plate of aluminum or by getting a piece of
> "perf" board from Radio Shack for about $2 and trim it
> to fit.
>
> Your method works.  It just costs about three times as
> much.  Neither method is "restoring" since the power
> supply is not returned to ORIGINAL configuration.
> Thus, either method can be used to REPAIR the HP-23
> series.  By the way, this also works in the SB-400 and
> SB-401 which use an internal power supply that is
> similar in design to the HP-23 series.
>
> The original question was about replacing the
> capacitors in two HP-23 power supplies.  If eight
> capacitors are purchased at $4.23 that comes to a cost
> of $33.85.  Ten capacitors can be purchased at a total
> cost of $34.50.  I would go the extra 38 cents and get
> 10 capacitors!
>
> That makes the cost of repairing one HP-23 $17.50 as
> opposed to $40.16 (four capacitors at $9.21 plus four
> brackets at $.83).  Both of these do not figure in the
> shipping costs which will be identical since neither
> makes the minimum weight.  Also, there will be two
> extra capacitors for another project.  If they were to
> do three HP-23 and get twelve of the capacitors at
> $3.45 each, then the cost of doing these three would
> only be $13.80 total.  That is a whole lot cheaper
> than $40.16.  In fact, this is a little over 34
> percent as much.
>
> Anyway, I think that we have answered the original
> question as to a possible source of replacement
> capacitors for the HP-23 series power supplies!
>
> Glen, K9STH
>
> --- "Charles W. Morehouse" <w4gbw at brevard.net> wrote:
>
> THATS FINE, HOW ARE YOU GOING TO MOUNT THEM?
>
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