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19H5

Sensibly equivalent to:
2S/550C CV490
    
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The 19H5 high-vacuum rectifier was originally designed by Ediswan Mazda but was supplied to the British Services by several manufacturers. The heater rating is 4 V, 4 A.
The 19H5 is described as a very low impedance diode for charging and clamping applications in Radar.
Since the 19H5 is a high-voltage rectifier (PIV = 20,000V) it is important that each leg of the filament should be exactly coaxial with the surrounding anode (ie. equal spacing in all directions). This is why the anode structure is subdivided into 4 cylinders. The ends of each heater leg are cooled by their supports and cannot supply the same emission density as the central section.
The output current rating of this valve in normal service is 350 mA so a full-wave pair could supply up to 20 kW at around 6 kV DC.
The base is a giant Edison screw and the anode connects to the top cap.
The construction is unusual in that the pressed sheet anodes are formed to produce four cylindrical cavities, 60 mm long and 12 mm in diameter. Each anode cavity contains a single heater and cathode. Thus the valve is in fact four rectifiers operated in parallel.
The wide glass tube envelope is 52 mm in diameter and, excluding the base pins, is 230 mm tall.
Reference: Datasheet. Type 19H5 was first introduced in 1954.

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
4.0
4.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 04, 2013.
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