Cossor designed and made EHT rectifiers such as the SU2150A for use in CRT power supplies. Because the Cossor works tended to employ skilled glass-blowers rather than just factory girls, and because they were designing for a very limited market, the Cossor EHT rectifiers were designed to be hand made. Although naive looking they were electrically robust and entirely successful in their intended application.
The saddle anode with large clearance between anode and cathode. The anode is supported on glass rods attached to the pinch.
The anode is ribbed for structural strength. It has been left bright as the power level is low.
The oxide coated cathode tube.
The Bakelite top cap with screw connection. This style of top cap was phased out in favour of the top hat top cap in the mid 1930s.
The classic envelope is 50 mm in diameter and, excluding the B4 base pins, is 129 mm tall.
