Bogey value

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In manufacturers' specifications for electronic devices, a bogey device (or bogie device) - especially a vacuum tube- is one that has all characteristics equal to the published values, in other words that its parameters all lie in the centre of their bell curve distributions.[1]

Parameter value[edit]

A bogey is a published value for a parameter of an electronic component, such as a vacuum tube, that is average or typical of devices that will be sold, and which the device's manufacturer is attempting to achieve.[2] With manufacturing tolerances and variables in production, most devices produced do not exactly meet the bogey value for each parameter.[3]

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 testers and be expected to give readings in the middle of the meter's "good" region.[3] Hence a tube can be specified by its bogey values and suitable tolerances,[4] and tests are based on the bogey values.[5] 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.[6]


  1. ^ Atwood, John (December 2000). "Just What Are Maximum Ratings?". Tube CAD Journal. 2 (9): 18. 
  2. ^ Modjeski, Roger A. (2011). "The Virtues of Power Tube Matching". Ram Labs Music Reference. Retrieved 15 November 2013. 
  3. ^ a b "Bogey Tube Facts" (PDF). Retrieved 15 November 2013. 
  4. ^ Matthews, Richard. "The myth of "tests as new"". Leeds Radio. Retrieved 15 November 2013. 
  5. ^ Sanlett, Steve. "II. What does Matched Pair mean?". Penta Labs. Archived from the original on 17 February 2007. Retrieved 15 November 2013. 
  6. ^ "The VAC Statement 450 Mono Beam Power Amplifier Operation and Maintenance INformation" (PDF). VAC. 26 July 2011. Retrieved 15 November 2013.