722-D

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General Radio 722-D
Precision Capacitor
General Radio 722-D Precision Capacitor

Available from 1936 to 1959

Manuals
  • Manual Needed
Catalog History
 Document Year Page
Catalog J 1936 31
Catalog K1 1939 46
Catalog K2 1942 43
Catalog K3 1944 41
Catalog K4 1945 41
Catalog L 1948 44
Catalog M 1951 46
Catalog N 1954 50
Catalog O 1956 151
Catalog P 1959 164
(All manuals in PDF format unless noted otherwise)

The General Radio 722-D Precision Capacitor was introduced in Catalog J (1936) and remained available through Catalog P (1959).

The Type 722-D is a laboratory quality, dual section, precision variable capacitor. The capacitor is supplied with a wooden carrying case fitted.

A direct reading of both sections is obtained from a drum mounted on the rotor shaft.

The rotor is mounted on ball bearings in an aluminum casting driven by a precision worm drive, and is electrically attached to the frame with silver overlay contacts.

The two stators are brought out to separate terminals on the panel with the shared rotor terminal. 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.

Specifications

  • Capacitance Range 25 to 100 pF and 100 to 1100 pF
  • Dial Accuracy: High Range ±1 pF ±0.1%; Low Range ±0.2 pF ±0.1%
  • Maximum Voltage: 1000 V peak

Links

Photos