Focused to stereo high-fidelity, including tube audio, home theater, and especially vintage 1970s gear, even vintage TV receivers. Site offers discussion forums, help, and general information for the audio enthusiast.

Focuses on indoor FM antenna design and a Hafler circuit for surround sound. Also, includes a directory of related links.

Offers consumer-generated product reviews, ratings, prices for brands and models.

Includes information, reviews and technical guides for equipment and accessories.

A vintage high-fidelity portal for discussing and displaying classic and vintage amplifiers, tuners, turntables such as Thorens, Quad, and pick-up arms. Also, provides a classified listings.

Offers reviews and evaluations of headphone equipment. Includes a buyers guide.