> It seems to me that there is some non-linearity in the audio stages that > sets in at a fairly low level. I'm not an expert either, but might the > isolating transformers in the line output be the cause of this?
Yes, see Jack Smith's work on the topic http://www.cliftonlaboratories.com/non-linear_transformer_behavior.htm ...and the link to a fix that offers better performance: http://www.elecraft.com/K3/mods/K3_AF_Stage_Upgrade_Instructions_Rev_B.pdf It appears your K3 has not yet been modified although don't expect a complete elimination of distortion products through the K3's transformers. The problem is not lmited to the K3: distortion produced in small, datacom transformers is dependent on the source impedance preceding the input to the transformer. Some folks, like K9YC, advocate the elimination of the transformers as long as you're reasonably careful with your audio interconnection practices. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
