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The DLS1 is not a valve but a thermal delay switch.
The filament is clearly visible with a flat plate to the left. The filament would begin to heat as soon as the apparatus was switched on, as wood the heaters of the rest of the valves. At a pre-set time the heating effect of the filament would cause a bi-metallic strip to bend to the extent that the switch contacts would be made. These devices were usually used to prevent HT voltages being applied to mercury vapour rectifiers until the heater was up to temperature.
Any valve requiring such protection could similarly be used with this type of switch.
The classic envelope is 43 mm in diameter and, excluding the base pins, is 104 mm tall.
This exhibit was last updated on 07 August 2006
The filament is clearly visible with a flat plate to the left. The filament would begin to heat as soon as the apparatus was switched on, as wood the heaters of the rest of the valves. At a pre-set time the heating effect of the filament would cause a bi-metallic strip to bend to the extent that the switch contacts would be made. These devices were usually used to prevent HT voltages being applied to mercury vapour rectifiers until the heater was up to temperature.
Any valve requiring such protection could similarly be used with this type of switch.
The classic envelope is 43 mm in diameter and, excluding the base pins, is 104 mm tall.
This exhibit was last updated on 07 August 2006
The classic envelope is 43 mm in diameter and, excluding the base pins, is 104 mm tall.
This exhibit was last updated on 07 August 2006
This exhibit was last updated on 07 August 2006 |