[Elecraft] Audio transformers needed

[Ed]

Two that I have used with good results are “Triad TY-304P” and “Etal P-3356”.  These are quality 
transformers and are readily available.  Just enter the part number in your search engine.

Radio Shack also has several available that should work just fine. 

Just a note:   A transformer is not required for interfacing to a K3 Line in/out.  Transformer
isolation is supplied internally.