reference design
Technical blueprints intended for free copying by others
All American Five
colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design
Wireless World Quality Amplifier
classic tube amplifier design by W. T. Cocking
Utility Radio
standardized, simplified radio receiver made in the UK during World War II
Government inventory locomotives
uniform group of locomotive classes in Russian Empire created in anticipation of the 1877-1878 war with Turkey
reference architectural design
architectural and civil engineering designs intended for mass production or permitting replication
Williamson amplifier
1947 reference design of a low-distortion push-pull tube amplifier