From the August 1940 introductory ad in Radio News:
"The new 1941 SUPER SKYRIDER.
A few fundamentals of the new Super Skyrider are 6 bands covering 540kc to 43 mc - 2 stages of preselection - high fidelity, push-pull audio - band pass audio filter - a new and highly efficient crystal filter circuit - an additional and completely effective noise limiter - cadmium plated steel chassis - standard relay rack panel 1/8 inch thick - machine tool, gray wrinkle, well ventilated steel cabinet. Hallicrafters-Jensen Bass Reflex speakers available. Sells, complete with crystal and 14 tubes, less only speaker, for $159.50 net."
(Later ads corrected the tube count to 15.)
Hallicrafters SX-28
Super Skyrider logo
The SX-28 is arguably Hallicrafters' finest pre-war set (short of the specialty-market dual diversity DD-1). It is a very well designed and engineered single conversion Broadcast and HF receiver. It uses push-pull 6V6 audio output tubes and is known for excellent sound on AM broadcast. It was often advertised with a large matching Hallicrafters-logo floor-model Jensen speaker. The PM-23 speaker is also a match for the SX-28. Many of these radios saw service during the War. The SX-28 and its sister VHF models, the S-27 and S-36 were rack-mounted in British government listening posts for monitoring German radar and communications. The Radio Intelligence Divison