This 7-tube circuit was obtained from an American publication in 1947. The circuit has a push-pull output with a source using a transformer.
This circuit was found in a 1967 General Electric documentation. The circuit generates signals...
This interesting effect circuit was found in a 1982 publication. The sequence of musical notes is...
This circuit is from a 1969 General Electric manual. The SCR may be the TIC106. Similar circuits...