The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x 50 mA relay. The other components are common.
This interesting circuit that can use modern equivalent transistors like the BF245 and BC548 was...
This oscillator does not carry any resonant circuit, except for the one formed by the crystal...
Carefully removing (and a lot of work) the cover of a metallic 2N3055 to expose its joints it...