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..
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