The SU2150 is the EHT rectifier from Cossor. The SU2150 has a higher voltage and lower current than the SU2150A classic HT rectifier.
The 'top hat' anode connector on this valve makes it a later production than the SU2150A referenced above. This suggests that the two valves existed side by side during the 1930's.
The effective series resistance needs to be 100,000 Ω and the reservoir capacitor is limited to 0.25 μF.
The saddle shaped anode and oxide coated rod cathode made the Cossor EHT rectifiers the most reliable.
The classic envelope is - mm in diameter, and excluding the B4 base pins is - mm tall.
References: 1040 & 1043. Type SU2150 was first introduced in 1937.
Absolute Maximum Operating Conditions¶
Updated April 27, 2013. shape:classic construction:pinch type:rectifier.hw age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.- pin:2.- pin:3.f pin:4.f pin:tc.a