This is a rare example of a De Forest style triode. The Candelabra base connects to the single strand filament. The silk insulated wires connect to the anode and grid. The anode is a bright cylinder 17 mm long by 10 mm in diameter. The grid is an open weave of fine wire carried on a single thin rod between two end supports.

See also R 2.

The balloon envelope is 48 mm in diameter and, excluding the Candelabra base is 85 mm tall.

This exhibit was last updated on 25 January 2003