🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiРусскийالعربية한국어中文日本語EntityQ1369071· pop 21· linked from 281 articlesmagic eye tubevacuum tube which gives a visual indication of the amplitude of an electronic signalConnectionsvacuum tubeEntityMOSFETEntityCategoriesRadio electronicsVacuum tube displays