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The AC104 is similar to the original AC044 but the amplification factor is 10 rather than 4 and was fed directly from the detector.

The design use was for audio output and it is directly heated.

The gettering obscures most of the dome.

Looking up from the base it can be seen that the bright anode is mounted horizontally. The oxide coating was probably formed by the Azide process.

The balloon envelope is 50 mm in diameter and, excluding the B4 base pins, is 92 mm tall.

References: Data-sheet & Data. Type AC104 was first introduced in 1930. See also 1930 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum