Millen 90721 Hetrofil

Object/Artifact

-

Radio Alpha

Image: Radio's Master Encyclopedia, copyright 1939

Image: Radio's Master Encyclopedia, copyright 1939

Name/Title

Millen 90721 "Hetrofil"

Description

Audio Filter

Category

Other

Made/Created

Manufacturer

James Millen

Date made

1939 - 1941

Other Name

"Hetrofil"

Valuations

Value

$3.50

General Notes

Note

QST, Nov 1939, p. 87. Radio's Master, copyright 1939, p. H-130. Based on a project in the September 1939 issue of QST, p. 11. Audio input and output connection are screw terminals located on the underside of the unit. Brief review. Radio, Nov 1939, p. 61.