Three stage experimental audio amplifier, unit housed in a wooden case with three copper-lined compartments that isolate each section. All controls and inputs are on the front panel. Separate input jack for each section with one output jack after the final section. Terminals for the tube voltages and a control for each of the tube filaments are also on the front panel. Unit now has only one tube installed - a Radiotron UX-112A in the first section. Top of case is hinged. No maker labels. Capacitors dated 1915. No extant makers marks..
Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.
If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.