My favorite 1920's radio receiver circuit is the Browning-Drake, which was very popular with radio kit builders through most of the 1920s. Here are a few links with information about this radio:
http://www.oldradiobuilder.com/Nielsen% ... Drake.html
http://www.clarion.org.au/browning-drak ... gDrake.htm
Yup, it seems to be popular among vintage radio builders, even today! It had a tuned RF amp, neutralized, of course. Triode RF amps have a nasty tendency to oscillate due to plate to grid capacitance. A little negative feedback, controlled by a balancing condenser, solved that. Eventually, screen grid tetrodes were developed to better solve the problem, but neutralization is very 1920's! The RF stage was followed by a regenerative detector and one or more AF amp stages. Very nice!
Some other good ideas can be found in the 'Knock Out' receivers booklet, at the link below:
http://oldradios.co.nz/downloads/1920's ... eivers.pdf