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 Post subject: Western Elec Diodes ?
PostPosted: Oct Wed 30, 2019 8:30 pm 
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Anybody know the specs on these. Tried to look them up but no luck. I have several still in the original boxes, Western Electric, dated 1961. Based on the date I would think they are Germanium. At 10 ma forward current the drop across the diode is 1.8 volts. Tested to 30 volts reverse bias, showed no breakdown so not a Zener. Strange how the one lead is gold plated (anode end) and the other just plain tin coated
Discard or useful to someone ?


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 Post subject: Re: Western Elec Diodes ?
PostPosted: Oct Wed 30, 2019 9:31 pm 
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Specs are here page 59
http://doc.telephonecollectors.info/dm/ ... _ocr_r.pdf

DM


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 Post subject: Re: Western Elec Diodes ?
PostPosted: Oct Wed 30, 2019 10:28 pm 
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Thanks devilsmist,
Well it appears I have two fundamentally different diodes, same pkg, same number but the letter suffix is important. 426H appears to be a type of 3 volt Zener, the 426Y is listed as surge protector. Just for giggles I will test the Zener/voltage regulator later..
Interresting looking early packaging, guess I will just throw them in the junk drawer for now.
EDIT: Misread the info in the tables, see my later posts.

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Last edited by pauls.ironhorse on Nov Fri 01, 2019 4:02 pm, edited 1 time in total.

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 Post subject: Re: Western Elec Diodes ?
PostPosted: Oct Thu 31, 2019 12:42 am 
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You can put them on Ebay, certain things with WE printed on them go for big bucks. WE solder,wire, tubes, etc.


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 Post subject: Re: Western Elec Diodes ?
PostPosted: Nov Fri 01, 2019 12:48 am 
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From a quick look at the data book linked above, the 426H is an 1800 PIV power rectifier and the 426Y is a 6.8 V Zener diode.

The 426H would be a good choice to replace a tube rectifier when the voltage rating of a 1N4007 isn't high enough.

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 Post subject: Re: Western Elec Diodes ?
PostPosted: Nov Fri 01, 2019 4:42 am 
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Location: Sayreville, NJ 08872
I have been using the 426H in a full wave configuration to replace two 5R4G rectifiers since mid 70's in one of my amateur transmitters.
I have the original binders with all the specification sheets for all the WECo semiconductors.

Since the WECo diodes were all "apparatus coded", I have the "Apparatus Card Catalog" for the diodes. Here is Card 1 and 2 for the 426 Series:
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 Post subject: Re: Western Elec Diodes ?
PostPosted: Nov Fri 01, 2019 4:00 pm 
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My thanks to devilsmist and manualman for the infomation.
So according to what the tables and other lists shown, the 426Y is a 6.8V regulator (type of Zener?). The 426H is a diode with 1800v reverse voltage rating. Seems very strange to use the same number for so wildly different applications with the single letter designator to differentiate. Very easy for a tech newbie to use the wrong type and damage equipment.

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 Post subject: Re: Western Elec Diodes ?
PostPosted: Nov Fri 01, 2019 6:33 pm 
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pauls.ironhorse wrote:
My thanks to devilsmist and manualman for the infomation.
So according to what the tables and other lists shown, the 426Y is a 6.8V regulator (type of Zener?). The 426H is a diode with 1800v reverse voltage rating. Seems very strange to use the same number for so wildly different applications with the single letter designator to differentiate. Very easy for a tech newbie to use the wrong type and damage equipment.

The majority of the WECo. parts were not available to the general public. i.e. You couldn't go to your local Radio Shack or Lafayette and buy a 426H Diode.

Designation is no different then using the 1N4000 series of rectifier diodes. Here it's a single number differentiator.
1N4001 rated 50V
1N4002 rated 100V
1N4003 rated 200V
1N4004 rated 400V
1N4005 rated 600V
1N4006 rated 800V
1N4007 rated 1000V
Never assume anything when it comes to voltage and current. Always check the specs of the parts in question.
The majority of all the Bell System new hires in the many technical fields already possessed good skills in parts evaluation, usage, and procuring and understanding design specifications. If we wanted parts to fail, we generally did it intentionally. :D

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