[Milsurplus] G11 Diode

[Jim Whartenby]

RayNick England shows some photos of a USM-26A aka FR-38B/U athttp://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>
 To: "mrca at mailman.qth.net" <MRCA at mailman.qth.net>; Military Surplus Mail List <milsurplus at mailman.qth.net> 
 Sent: Saturday, December 2, 2017 11:25 AM
 Subject: [Milsurplus] G11 Dioede
   
 <!--#yiv5992170444 P{margin-top:0;margin-bottom:0;}-->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 rating  but 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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