The CV1089 power triode is WW2 vintage. The filament is a bright wire helix connected to the two base pins by stout rod supports. The grid is brought out to the side contact and stands on wire supports and encloses the filament. The anode is a copper bell with external brass collar.

The wide glass tube envelope is 60 mm in diameter and, excluding the base pins, is 308 mm tall. The cooling collar is 85 mm in diameter and has holes drilled through it to form air tubes.

This exhibit was last updated on 20 January 2003