This 1924 receiver uses a battery for the tube filaments and a high voltage battery for the amplifier and detector circuit. The speaker is kind of high impedance era.
The configuration shown is suggested by National Semiconductor in its 1994 Linear Applications Handbook....
This simple receiver, which requires a good antenna and grounding, was found in an Argentine...
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...