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#6
February 18th 04, 11:57 AM
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"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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