The Philips Miniwatt A110 is a dull emitter triode from the mid 1920s. The A110 was designed for both HF and LF amplification but in the 1920s HF was only a few MHz.
The envelope provides the key operating details of filament volts - 1.0 to 1.3 V and anode volts between 20 and 100 Volts.
The electrodes are mounted horizontally and can just be seen under the silver gettering.
The anode cylinder has a lower flat flange that the supports from the pinch connect to.
A μ-Tracer plot of the characteristic curves for this exhibit.
The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 74 mm tall.
Reference: 3002. Type A110 was first introduced in 1925. See also1925 adverts.
