The Cossor RC is from their Point One series. This series of dull emitter valves took just 100 mA of filament current.

The valve is heavily silvered from the magnesium gettering but at the top of the dome the silvering is absent allowing a view into the valve. The anode appears to be tapered at the top and twin tension coils suggest a double inverted V filament. No grid supports are visible.

Cossor describe the valve on the label that runs around the base of the envelope as: specially designed for resistance capacity coupling. This indicates an audio voltage amplifier role.

The Balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 97 mm tall.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va
	3.64	0.1	120

This exhibit was last updated on 31 July 2005