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Mullard Flash-tube General Data
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The LSD7 is a Xenon flash tube designed for studio photo-flash equipment.
The maximum energy is a 200 Joules the same as a mid energy studio flash of today. The maximum anode voltage is 2,700 Volts and the breakdown voltage is greater than 3,000 Volts. The trigger electrode would normally receive a pulse of 5 kV or so. The Xenon gas filling gives a colour temperature for the discharge that corresponds to noon daylight, approx 5,500 °K.
The flash duration given is 200 μs. Modern units for studio work operate at about 400 Volts and the flash duration is about 1 ms. The tube life is given as a minimum of 10,000.
The mesh surrounding the centre leg of the flash tube is the trigger electrode.
The envelope is 30 mm in diameter, and excluding the UX4 base pins is 90 mm tall.
Reference: Data-sheet.


Absolute Maximum Operating Conditions
Flash Tubes
PDF scanned from an original document held by the museum
Updated February 21, 2014.
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