Queen Self-Regulating Tube (1897-1900) |
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| One of the first types of regulated tubes. The regulator is unique in that it incorporates its own anode and cathode and is isolated from the main tube. The source of gas is the white chemical (potash) lining the inside of the small pointed bulb opposite the regulator’s cathode. Electrons from the latter would heat the bulb when the regulator is active. Another unusual feature is the spiral electrode located toward the side of the main tube. Since it is electrically connected to the regulator, it might be intended to serve as a secondary cathode when current is flowing through the regulator. | |
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Note the low mass platinum target. Such a design could not withstand prolonged intensive use. Manufactured by Queen & Co. of Philadelphia. The paper label on the glass arm housing the cathode gives a patent date of 1897.
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