# Bogey value

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In manufacturers' specifications for electronic devices, a '''bogey device''' (or '''bogie device''') - especially a [vacuum tube](/source/vacuum_tube)- is a device that has all characteristics equal to the published values, in other words, that its parameters all lie in the centre of their [bell curve](/source/Normal_distribution) distributions.<ref>{{cite journal | url=http://www.tubecad.com/december2000/page18.html | title=Just What Are Maximum Ratings? | author=Atwood, John | journal=Tube CAD Journal |date=December 2000 | volume=2 | issue=9 | pages=18}}</ref>

==Parameter value==

A bogey is a published value for a parameter of an electronic component, such as a [vacuum tube](/source/vacuum_tube), that is average or typical of the devices that will be sold, and which the manufacturer is attempting to achieve.<ref name=MusicRef>{{cite web | url=http://www.ramlabs-musicreference.com/virtues.html | title=The Virtues of Power Tube Matching | publisher=Ram Labs Music Reference | year=2011 | accessdate=15 November 2013 | author=Modjeski, Roger A.}}</ref> With manufacturing tolerances and variables in production, most devices produced do not exactly meet the bogey value for each parameter.<ref name=qsl.net>{{cite web | url=https://www.qsl.net/k/kb1uif/downloads/Documents/Misc%20Ham%20related%20Documents/bogey_tube_facts.pdf | title=Bogey Tube Facts| accessdate=22 December 2023}}</ref>

Apart from a bogey device being a ''theoretical'' device that has the given characteristics, the term can refer to a specially-selected example of a device (e.g. from a production run where care is taken to ensure each characteristic has its nominal value); for example a '''bogey tube''' could be used to calibrate [tube tester](/source/tube_tester)s and be expected to give readings in the  middle of the meter's "good" region.<ref name=qsl.net/> Hence a tube can be specified by its bogey values and suitable tolerances,<ref>{{cite web | title=The myth of "tests as new" | url=http://leedsradio.com/technical/testslikenew.html | publisher=Leeds Radio | accessdate=15 November 2013 | author=Matthews, Richard}}</ref> and tests are based on the bogey values.<ref name=Penta>{{cite web | url=http://www.pentalabs.com/audio_help2.html | archive-url=https://web.archive.org/web/20070217064458/http://www.pentalabs.com/audio_help2.html | url-status=dead | archive-date=17 February 2007 | title=II. What does Matched Pair mean? | publisher=Penta Labs | accessdate=15 November 2013 | author=Sanlett, Steve }}</ref> For applications such as music amplifiers where the channels need to have nearly identical performance, it is desirable that components are matched and have major parameter values close to bogey.<ref>{{cite web | url=http://www.vac-amps.com/manuals/Manual_Statement450.pdf | title=The VAC Statement 450 Mono Beam Power Amplifier Operation and Maintenance INformation | publisher=VAC | date=26 July 2011 | accessdate=15 November 2013}}</ref>

==References==
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Category:Electronics manufacturing

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Adapted from the Wikipedia article [Bogey value](https://en.wikipedia.org/wiki/Bogey_value) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Bogey_value?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.