File:TFR Tube Layout.jpg

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English: Six tube antique Tuned Radio Frequency receiver from the early 1920s, showing tube layout. Before the superheterodyne receiver, radios did most of the amplification of the signal at the radio frequency. The low gain of early vacuum tubes at radio frequencies required many tubes to achieve adequate volume.
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Author Sweidman

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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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current19:24, 15 April 2009Thumbnail for version as of 19:24, 15 April 20091,024 × 768 (311 KB)Sweidman (talk | contribs){{Information |Description={{en|1=TRF Radio Typical Tube Layout.}} |Source=Own work by uploader |Author=Sweidman |Date= |Permission= |other_versions= }} <!--{{ImageUpload|full}}-->

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