[Milsurplus] 1N21's and 1N23's

[J. Forster]

I thought the 1N23 were not used above X band. The 1N78s were used in K band.

-John

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> I believe that the 1N3655 is a more "modern" equivalent that is good for
> up to 17 GHz.  Those diodes have a removable adapter that can be put on
> either end to change the polarity.  The prices that I have found on the
> Internet for the 1N3655 range from like $49 to $150 each.
>
> Somewhere over the years I have acquired 2 or 3 boxes of the 1N3655 that
> have 10 of the diodes in each box.  The diodes are encapsulated in lead
> envelopes.  These particular diodes have gold plated ends as well as the
> adapter is gold plated.
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Tue, 12/15/09, jmfranke <jmfranke at cox.net> wrote:
>
> Over the years, there have been many different 1N21/22/25/23 cartridge
> diodes.  They all fit a standard holder and were made for a common
> outline, but have had different set screw configurations.  Some have base
> screws, side screws, and even a variant with a screw down the axis of the
> tip.  Some had single or multiple set screws in the edge of the disc at
> the base of the tip versus in the large base.  Some had no screws.  Some
> have removable end caps to facilitate reversing the polarity - which was
> done for magic-tee and other balanced mixer applications.  The end caps
> either gripped the pin or had a set screw.  The removable end caps make
> handy connectors for the tips. Most of the diode contacts were gold plated
> although many of the earliest diodes had silver plated contact surfaces. 
> On some you could see the fill hole in the side of the ceramic cylinder
> where a potting or stabilizing compound was inserted.  And, the variations
> were within a
>  series, such as the 1N23B.  So even a series did not stay with a fixed
> configuration.  Some day I will put together a display with the various
> forms of the "standard" cartridge.
>
>
>
>
>