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Pre-Aging Neon Tubes

IP.com Disclosure Number: IPCOM000098121D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Nick, HH: AUTHOR

Abstract

Neon tubes are pre-aged prior to incorporation in a circuit to stabilize their characteristics. The method comprises two or three periods of pre-aging, utilizing an alternating current. This varies about a reference value somewhat lower than the ignition potential of the tubes and somewhat higher than the maintaining potential. Best results are obtained by use of a frequency of alternation in the range of 60 to 400 cycles per second.

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Pre-Aging Neon Tubes

Neon tubes are pre-aged prior to incorporation in a circuit to stabilize their characteristics. The method comprises two or three periods of pre-aging, utilizing an alternating current. This varies about a reference value somewhat lower than the ignition potential of the tubes and somewhat higher than the maintaining potential. Best results are obtained by use of a frequency of alternation in the range of 60 to 400 cycles per second.

Either a sine wave generator 1 or square wave generator 2 may be selected by means of switch 3. Circuits from the generator 1 or 2 through the tube 4 may be selected by switch 5 to include either resistor 6, 7 or 8.

As an example, the first aging period may consist of applying the sine wave voltage for a period of 24 hours through resistor 6 so that the current through tube 4 is higher than the normal current. The second aging period may consist of applying the sine wave voltage for a further period of 24 hours through resistor 8 so that the current through the tube is lower than the normal current. If desired, a third period of aging may consist of applying the sine wave voltage through the resistor 7 for a further period of time so that a normal current is passed through the tube.

The values of the resistors 6, 7 and 8 and the duration of the aging periods vary according to the characteristics and composition of the tube, the magnitude of the applied voltage and the required degree of stability.

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