Look under Fada, Atwater Kent Model 20, or Stewart Warner 300 series radios here on nostalgiaair under schematics. Many companies made these battery radios but most weren't included in Rider. In a neutrodyne internal tube capacity in cancelled.
Most of these radios used 01A tubes. UX201A, CX301A are older globe versions of the tube. AES, tubesandmore.com and Play Things of Past, oldradioparts.com sell parts.
Audio interstage transformers are often open.
Norm
: I ran across a neutrodyne (circa 1924ish). Does anyone know where I can find a schematic and instructions on how to tune one of these...I am missing all the tubes and several knobs and am also interested in locating these missing parts. Any help would be appreciated...thanks,