Bogey device

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.
Parameter value
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. With manufacturing tolerances and variables in production, most devices produced do not exactly meet the bogey value for each parameter. A bogey device could be a theoretical device that has the given characteristics, or a specially-selected device (e.g. from a production run where care is taken to ensure each characteristic has its nominal value) - in which a bogey tube could be expected to give readings in the middle of the "good" region. and tests are based on the bogey values. 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.
 
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