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Hi, Well it was over 20yrs ago hi!! but I seem to remember
it was a twin triode setup from Ron...... On Wed, 18 Feb 2004 06:57:27 -0500, "Edward A. Feustel" wrote: "Ron" wrote in message ... Hi, I'm building a small valve communication receiver in an effort to recapture some of the fun of my youth ![]() And I am trying to find a circuit of a simple valve CW Audio filter Years ago I built one from a circuit that was in the ARRL handbook about 60's vintage, that was superb, anyone got an old Handbook of that vintage that could have a look and possibly scan the info, or possibly have a good one of their own using standard valve componants!! long shot I know ![]() Thanks from Ron G3YUH Do you recall if it was a twin-T filter? I might be able to find a tube implementation. As I recall it took a twin triode and used feedback. Was your filter tunable? N5EI |
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