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The DAC21 is a battery diode triode. The design purpose was as detector and AF voltage amplifier.

The Philips/Mullard naming convention usually denotes the first number two to indicate a B8B base. Here the base is International Octal.

The base cap also has DAC21 printed on it - clearly intended.

The IO base pins.

Thanks to Mark Mallison for sending the images.

The classic envelope is  mm in diameter, and excluding the IO base pins is  mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.