[MrFixr55]

Very few radios before maybe 1933 had a diode detector.  There is a Philco Model 3 Transitone Car radio Ca 1930 -1931 that used a '71A (of all things) with the plate grounded to the cathode, as a diode, a '01A as a 1st AF and another '71A as an output stage.  Power output of this radio was less than or equal to 0.7 Watts.  The radio ran off the 6V Car battery and 180V worth of B Batteries.  3Stage RF Amp used "24As.  The RCA Receiving Tube Manuals of the days Described the Grid Leak Detector as having a higher level of distortion than the "Biased Detector (Power Detector), as used in your Majestic.  Diode Detectors have less distortion than either, according to the RCA Receiving Tube Manual.

A biased detector was cheap to produce, and this was the beginning of the Great Depression.  Interestingly, even the Radiola 60 and other RCA radios produced during the "Roaring 20s" used grid leak or biased detectors, as they required fewer tubes than the separate diode detector and triode 1st AF Amp.