Linear Audio, your tech audio resource, continues to offer you stimulating, interesting and thought-provoking articles as well as projects you can build. Volume 4 is our 5th issue, and the first one that crept over 200 pages in size. Still no ads though! Subject matter includes triode noise, listening tests, tube and solid state phono preamps, SIT based designs, perception-based measurements, DAC design, PSU auditioning and supply decoupling. Don’t forget to visit the Online resources area on www.linearaudio.net for complementary papers and comments to articles. Happy reading, but don’t forget to listen to your music!