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

[Glen Zook]

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.