I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor availble that time and hard to obtain today. The circuit is indicated for phono applications using variable reluctance transducer.
Suggested by General Electric in a 1967 publication, this circuit uses the D13T1, an uncommon SCR...
This circuit is from the 80's component manual itself, but can be applied to more modern...
Suggested by a 1965 Electronic Design, this circuit was originally proposed for oscilloscope...