[Milsurplus] G11 Diode

[Peter Gottlieb]

You are right.

There are plenty of choices of fast recovery diodes available, like MUR120, 
check Digikey or your fav supplier.

Peter
kb2vtl


On 12/3/2017 12:17 PM, Jim Whartenby wrote:
> Perhaps but the parameters found in data sheet I found on the web is what was 
> reported.
> 1N451 Datasheet pdf - 170 V, 500 mA, gold bonded germanium diode - BKC 
> International Electronics 
> <http://www.datasheetcatalog.com/datasheets_pdf/1/N/4/5/1N451.shtml>
>
>
> 	
>
>
>     1N451 Datasheet pdf - 170 V, 500 mA, gold bonded germanium diode - BKC
>     International Electronics
>
> 1N451 datasheet, 1N451 pdf, 1N451 data sheet, datasheet, data sheet, pdf, BKC 
> International Electronics, 170 V, ...
> 	
>
> <http://www.datasheetcatalog.com/datasheets_pdf/1/N/4/5/1N451.shtml>
>
> A 1N4XXX diode is fine for 60 or so cycles but is not meant for high speed 
> switching.
>
> Jim
>
> --------------------------------------------------------------------------------
> *From:* Bob kb8tq <kb8tq at n1k.org>
> *To:* Jim Whartenby <antqradio at sbcglobal.net>
> *Cc:* Military Surplus Mail List <milsurplus at mailman.qth.net>
> *Sent:* Sunday, December 3, 2017 8:43 AM
> *Subject:* Re: [Milsurplus] G11 Diode
>
> Hi
>
> At least on the data sheet I found, the 1N451 has a Vf of 1V rated at 50 (not 
> 500, but 50) ma. That’s a whopping big
> Vf for a germanium part. More or less, you could have 5 “normal” germanium 
> diodes in series and meet that spec.
> I can’t find any capacitance data on the web for the diode. The part seems to 
> be rated at 80mw of dissipation. That
> would suggest that the 500 ma forward current number is a bit suspect as is 
> the designation “rectifier diode”.
>
> I’d say the 1N4007 is looking pretty good by comparison. The only issue might 
> be capacitance. A high speed
> diode likely would be a bit lower in that regard.
>
> Bob
>
>> On Dec 3, 2017, at 3:07 AM, Jim Whartenby <antqradio at sbcglobal.net 
>> <mailto:antqradio at sbcglobal.net>> wrote:
>>
>> Ray
>> Nick England shows some photos of a USM-26A aka FR-38B/U at
>> http://www.virhistory.com/navy/test.htm
>> Looks like CR203 through CR208 are 1N451 which is a Germanium diode with a 
>> PIV of 170 volts, leakage of 150uA @ 150 volts and a peak forward current of 
>> 500 mA.  Vf is 1 volt so one assumes that a silicon diode of similar PIV 
>> specs can easily replace it.
>> Qbus?
>> Jim
>>
>>
>>
>> --------------------------------------------------------------------------------
>> *From:*Ray Fantini <RAFANTINI at salisbury.edu <mailto:RAFANTINI at salisbury.edu>>
>> *To:*"mrca at mailman.qth.net <mailto:mrca at mailman.qth.net>" 
>> <MRCA at mailman.qth.net <mailto:MRCA at mailman.qth.net>>; Military Surplus Mail 
>> List <milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net>>
>> *Sent:*Saturday, December 2, 2017 11:25 AM
>> *Subject:*[Milsurplus] G11 Dioede
>>
>> Ok so working on this FR38B/U frequency counter and running into an issue. 
>> They use lots of early Germanium diodes to trigger and provide faster 
>> switching times in most of the vacuum tube stages.They have a part number of 
>> 212-G11A but I have not been able to find any information on them. Was 
>> thinking of replacing a lot of the week performing ones with 1N914 switching 
>> diodes but am a little concerned about voltage ratingbut have to assume that 
>> the late fifties first generation G11 has to be a lower voltage ratting then 
>> a modern silicone diode?
>> There is a panel that originally had a dozen diodes as spares in the unit but 
>> someone stole or used those years ago. They must have been a high failure 
>> rate device.
>>
>> Ray F/KA3EKH
>>
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