20's neutrodyne valve radio

[unrealdave]

from the description it seems the term "neutrodyne" was a type of radio.

Hiya Mike - fancy seeing you here

neutrodyne was just a method of using triodes to amplify rf before the screen grid came in.  The inter electrode capacitance in a triode (between the plate and grid) caused oscillation but the neutrodyne cap (usually just a small air spaced var cap) cancelled it out.  The SG valve was far better so the neutrodyne bit the dust.