File:ECO oscillator circuit.png

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Summary

Media data and Non-free use rationale
Description	Electron-coupled oscillator circuit with tetrode vacuum tube from QST magazine april 1932 article.
Author or copyright owner	James J. Lamb
Source (WP:NFCC#4)	Stabilizing Superheterodyne Performance, QST magazine, april 1932, pages 14 to 17
Date of publication	april 1932
Use in article (WP:NFCC#7)	Electron-coupled oscillator
Purpose of use in article (WP:NFCC#8)	For visual identification of the object of the article. The article as a whole is dedicated specifically to a discussion of this work.
Not replaceable with free media because (WP:NFCC#1)	Any derivative work based upon the artwork would be a copyright violation, so creation of a free image is not possible.
Minimal use (WP:NFCC#3)	The schematic shows the minimal circuit of an ECO oscillator.
Respect for commercial opportunities (WP:NFCC#2)	The use of a low resolution image of the artwork will not impact the commercial viability of the art.
Fair useFair use of copyrighted material in the context of Electron-coupled oscillator//en.wikipedia.org/wiki/File:ECO_oscillator_circuit.pngtrue

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File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	00:01, 20 January 2024		384 × 260 (48 KB)	DatBot (talk \| contribs)	Reduce size of non-free image (BOT - disable)
	14:14, 19 January 2024	No thumbnail	541 × 366 (48 KB)	AndreAdrian (talk \| contribs)	Uploading a non-free work, as object of commentary using File Upload Wizard

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Electron-coupled oscillator

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Horizontal resolution	37.79 dpc
Vertical resolution	37.79 dpc