722-N

The General Radio 722-N Precision Capacitor was introduced in Catalog K1 (1939) and remained available through Catalog P (1959).

The Type 722-N is a laboratory quality precision variable capacitor specifically designed for RF applications. It features low metallic resistance and low inductance, one third that of other 722 standard capacitors. Its direct reading from a drum mounted on the rotor shaft. The rotor is mounted on ball bearings in a aluminum casting driven by a precision worm drive. The rotor is electrically attached to the frame with silver overlay contacts. The stator is brought out to a separate terminal on the panel beside the rotor terminal attached to the chassis. The rotor terminal is a the same potential as the panel and copper lined walnut case. A correction chart is mounted on the panel for that particular capacitor. The capacitor is supplied with a fitted wooden carrying case.

Specifications

• Capacitance Range 100 to 1100 pF
• Dial Accuracy: ±1 pF ±0.1% measured at 1 kHz
• Maximum Voltage: 1000 V peak

Links

• Experimenter describing Types 722 February 1937
• Experimenter describing Types 722 January 1938
• Experimenter describing Types 722 October 1938

Photos

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 

  Carrying Case

• 

  Carrying Case