![]() The challenge was too hard to resist for many and the contest was popular for several years running. ![]() The use of an IC means that the set will not qualify for the 1AD nor for the 2AD bonus points." The use of integrated circuits can be interesting in that one IC can be used to build a full superhet. In the active set, any number of diodes (either solid state or tube diodes) may be used however, a tunnel diode or similar active device counts as the 1AD for the contest. ![]() Totally passive crystal sets are not allowed. Crystal sets may be used if one active device is added either inboard or outboard. If a tube envelope has more than one tube in it, use only one of those active devices to be counted as a 1AD. The device can be a bipolar, FET, tunnel diode or tube (triode, tetrode, pentode, or heptode), but only one device may be used. "Only one active device is allowed to be counted to get the 1AD bonus points. ![]()
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