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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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23rd Jun 2020, 7:18 pm
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#1 |
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Octode
Join Date: Nov 2010
Location: Cullompton, Devon, UK.
Posts: 1,435
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Enarde 7855 nrd identification
Any Ideas on this item found in box of crystals.
John |
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23rd Jun 2020, 10:03 pm
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#2 |
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Hexode
Join Date: Sep 2003
Location: Cheltenham, Gloucestershire, UK.
Posts: 298
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Re: Enarde 7855 nrd identification
Is that mercury inside it? If so, some form of high power position-sensitive switch would be my guess.
dave
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Dave Teague |
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24th Jun 2020, 8:50 am
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#3 |
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Octode
Join Date: Nov 2010
Location: Cullompton, Devon, UK.
Posts: 1,435
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Re: Enarde 7855 nrd identification
Hi Dave
I can't see any mercury in the unit just a metal sleeve connected to one contact and a ceramic insulated inner wire connected to the other end, each contact is different size so there is obviously a correct orientation. There is a marking in pencil of 600v so suppose it could be a spark gap or something. John |
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24th Jun 2020, 2:58 pm
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#4 |
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Hexode
Join Date: Sep 2003
Location: Cheltenham, Gloucestershire, UK.
Posts: 298
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Re: Enarde 7855 nrd identification
If you can measure (or estimate!) the 'gap' length that may or may not confirm 600v (but that seems quite a low voltage for a spark....)
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Dave Teague |
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24th Jun 2020, 3:45 pm
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#5 |
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Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Enarde 7855 nrd identification
Perhaps a gas-filled stabiliser tube? 600V does not sound unreasonable for that. Or a spark gap operating at low gas pressure (which will flash over at a lower voltage than the equivalent gap in air at atmospheric pressure I think)
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24th Jun 2020, 3:53 pm
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#6 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Enarde 7855 nrd identification
T/R spark gap tube?
Lawrence. |
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24th Jun 2020, 5:10 pm
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#7 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Enarde 7855 nrd identification
An Enarde logo comes up with Nucleonic And Radiological Developments Limited in Google books:
https://books.google.co.uk/books?id=...6AEwAXoECAMQAg Lawrence. |
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24th Jun 2020, 5:42 pm
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#8 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Enarde 7855 nrd identification
They also did corona discharge tubes for voltage stabilization:
https://worldradiohistory.com/hd2/ID...evelopments%22 Lawrence. |
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24th Jun 2020, 5:43 pm
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#9 |
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Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Enarde 7855 nrd identification
Early GDT. Even the little ceramic ones of today have radioactive gas inside - IIRC.
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24th Jun 2020, 8:26 pm
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#10 |
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Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,194
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Re: Enarde 7855 nrd identification
Geiger tube ?
Ed |
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24th Jun 2020, 9:25 pm
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#11 |
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Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,219
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Re: Enarde 7855 nrd identification
It looks very much like a corona discharge regulator to me.
Possibly similar to this one, but with a cap connector instead of pins: http://www.r-type.org/exhib/aaa0524.htm |
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