We found this circuit in Mullard's 1960s transistor manual. No information about transformers is given. Transistors are germanium types of the time.
This conventional oscillator can generate signals from 8 to 30 MHz depending on the crystal used....
This reverb effect was found in the December 1961 Radio Electronics magazine. It makes use of...
This circuit is from a March 1967 Radio Electronics. The circuit applies to general purpose SCRs...