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

[jmfranke]

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.

John  WA4WDL

--------------------------------------------------
From: "J. Forster" <jfor at quik.com>
Sent: Tuesday, December 15, 2009 6:17 PM
To: "Al Klase" <al at ar88.net>
Cc: "Ray Fantini" <rafantini at salisbury.edu>; <milsurplus at mailman.qth.net>; 
"Dennis Monticelli" <dennis.monticelli at gmail.com>
Subject: Re: [Milsurplus] 1N21's and 1N23's

> Interesting...  threads into ceramic material. Sounds like that's the
> whisker screw. The unit sounds reversible polarity.
>
> Thanks,
> -John
>
> ============
>
>> Folks,
>>
>> This conversation just sent me to the parts box where I knew some diodes
>> were lurking.  The Kemtron 1N23A's, that I have, have a set screw under
>> some wax right in the middle of the side of the ceramic body.  The also
>> have a set screw in the side of the large gold end that probably hold it
>> to a pin similar to the small end.  The 1N23B's and C's don't have the
>> screw in the ceramic.
>>
>> YMMV,
>> Al
>>
>> J. Forster wrote:
>>> Hi Ray,
>>>
>>> I don't understand this:
>>>
>>> "If you loosen the set screw on one
>>>
>>>> end they just become a pin on Bothe sides don't they?"
>>>>
>>>
>>> I think the "whisker" is attached to the screw. If you loosen it, you
>>> get
>>> an open circuit. If you screw it down too far, a short.
>>>
>>> -John
>>>
>>> ===============
>>>
>>>
>>>
>>>
>>>
>>>> Almost all the older series Harris FM broadcast transmitters used that
>>>> style diode in the reflectometer for sensing forward and reflected
>>>> power.
>>>> I have two FM-10 K series 10kW transmitters and one RCA 3 kW
>>>> transmitters
>>>> as standby transmitters that still use them, think the HT-20 20 kW also
>>>> uses them too. The design allows them to easily be changed in the event
>>>> of
>>>> damage although I have never had one fail, don't know if it's the same
>>>> number but definitely the same design, If you loosen the set screw on
>>>> one
>>>> end they just become a pin on Bothe sides don't they?
>>>> Ray Fantini KA3EKH
>>>>
>>>
>>>
>>> ______________________________________________________________
>>> Milsurplus mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Milsurplus at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>
>> --
>> Al Klase - N3FRQ
>> Jersey City, NJ
>> http://www.skywaves.ar88.net/
>>
>>
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>