File:RCA 24-A Screen Grid tube anode characteristics.jpg

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Description	English: Anode characteristic curves of the RCA 24-A tetrode vacuum tube. It shows the plate current (I_b) as a function of plate voltage for different values of control grid voltage (E_C2). The lowest curve shows the screen grid current (I_C2). This early tetrode illustrates the negative resistance "kink" in the plate current (labeled "values unstable") caused by secondary emission of electrons from the plate, that caused instability and parasitic oscillations in early tetrodes. Modern tetrodes have a coating on the plate which suppresses secondary emission, eliminating the "kink".
Date	1955
Source	https://archive.org/details/RcaTubeHandbookHb-3Vol.5-61955
Author	RCA

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	Date/Time	Dimensions	User	Comment
current	05:08, 12 December 2020	2,280 × 2,255 (1.86 MB)	Gutten på Hemsen	Cropped 18 % horizontally, 48 % vertically using CropTool with lossless mode.
	05:02, 12 December 2020	2,765 × 4,320 (3.68 MB)	Gutten på Hemsen	Higher resolution from source
	16:26, 5 January 2015	519 × 478 (98 KB)	G4oep	{{subst:Upload marker added by en.wp UW}} {{Information \|Description = {{en\|RCA 24-A Screen Grid tube anode characteristics}} \|Source = https://archive.org/details/RcaTubeHandbookHb-3Vol.5-61955 \|Date = 1955 \|Author = RCA }} {{PD-because\|The website...