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Title: How to Screen Modulate: Good 1965 Article Post by: WA4WAX on October 17, 2015, 10:57:39 AM Several William Orr circuits here. Also, the low down on that problematic Heath circuit. 12AU7's clean it up.
https://archive.org/stream/73-magazine-1965-09/09_September_1965#page/n2/mode/1up Matt Title: Re: How to Screen Modulate: Good 1965 Article Post by: DMOD on October 19, 2015, 03:17:25 PM If you are referring to the DX-35, it has always had 12AU7's as the screen modulator. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
An improvement to audio is to remove the 0.05 uF cap across the 2.2 Meg resistor in the first 12AU7 stage and use a rolloff circuit on the cathode of the second stage 12AU7. Phil - AC0OB More upgrades here: http://amfone.net/Amforum/index.php?topic=40779.0 |