The circuit selected is from the 1960 Mullard transistor reference manual. The circuit is powered by a single 1.3 V battery and the transistors are germanium.
This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the...
This circuit is suggested by Motorola and is based on the well-known 723, integrated voltage...
This circuit appears in other versions in this same section of the website and in other sections with...