Virtual Valve Museum

Virtual Valve Museum

HomeFull List

This is an archive website. It will not receive any updates, additions or corrections.

CV119 bolometer indicator

Size This device measures 65x24mm (glass) with an overall length of 170mm.


Current for "just glowing" 700mA
Max running dissipation 50W


The specs for this bolometer indicate the filament is tungsten, 0.15mm diameter wound and annealed to dull red on 0.56 mandril. Two 15mm lengths of the close wound spiral are stretched to 35mm and welded to the supports, then stretched to 37mm. Finally they are stretched to 40mm when sealed in. The filaments are 4mm apart.