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Vertical tube with two parallel wire cathodes at two end of tubes with third electrode to serve as anode on base.

For accurate work, in polished teak wood box and bakelite panel figured in white. Split brass contact blocks hold precision cut, interchangeable plug having moulded black bakelite fluted tops. Coils of constantine wire, double silk covered are wound co-efficient. Coils are connected with double nut system. Accuracy +, available in different ohms.