Project 2 – One tube receiver
Here is a one tube AM radio with a RF section (6EA7 H-MU) and a AF section (6EA7 L-MU). The AF section is able to drive a speaker.
For a one tube radio, we get decent reception. Listen for yourself:
In the video, H-MU section (RF) drain 0.21ma and L-MU (AF) drain 18.9 ma.
B+ is around 150 volt.