The E180CC is a special quality double triode designed for use in computer circuits. The E180CC will maintain its emission characteristics after long periods where the valve is biased to cut-off. This characteristic equates to use in a bi-stable or flip-flop circuit. The E180CC is not designed for audio use.
The heater is centre tapped for use at 6.3 or 12.6 Volts but in a parallel connection.
This exhibit has equipment makers markings as well, in this case IBM. It is also labelled as a 5965 showing that the two Types are equivalent.
The anode face view. Note that the anode is large for the current rating.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 59 mm tall.
References: Datasheet. Type E180CC was first introduced in 1954.