Type UX112A means a Type 112A fitted with a 'UX' style of base cap, ie. with pins rather than 'nubs' and a bayonet. The 112A was an early American directly heated detector or AF amplifier triode for small battery radios.
The load impedance would be 10,650 Ohms. However, the ratings may apply to later samples than our exhibit.
The balloon envelope is 42 mm in diameter and, excluding the UX4 base pins, is 98 mm tall.
References: Data-sheet & 1043. Type UX112A was first introduced in 1937.
Absolute Maximum Operating Conditions¶
Updated January 21, 2013. shape:balloon construction:pinch type:triode age:1930.1940 base:ux4 heater:5.0v pins:4 pin:1.f pin:2.a pin:3.g1 pin:4.f