From GRWiki
Jump to navigation Jump to search
General Radio 980-A
Decade Capacitor Unit
General Radio 980-A Decade Capacitor Unit

Available from 1956 to 1965

  • Manual Needed.
Catalog History
 Document Year Page
Catalog O 1956 158
Catalog P 1959 172
Catalog Q 1961 167
Catalog R 1963 157
Catalog S 1965 197
(All manuals in PDF format unless noted otherwise)

The General Radio 980-A Decade Capacitor Unit was introduced in Catalog O (1956) and remained available through Catalog S (1965).

The Type 980-A is a decade capacitance unit comprising four polystyrene capacitors sealed in two brass tubs mounted on either side of the switch. The capacitor values are selected in a "1-2-2-5" combination. In the Type 980-A these values are 0.1, 0.2, 0.2, and 0.5 μF. The eleven position switch maintains a combination of the four standard capacitors in parallel to produce the decade of capacitance values. The Type 980-A decade units are used in the Types 1419-A and 1419-B Decade Capacitors.


  • Total Capacitance: 1 μF
  • Capacitance Per Step: .1 μF
  • Accuracy: two or three terminal ±1%
  • Dissipation Factor: less than .0002 at 1 kHz
  • Maximum Voltage: 500 V
  • Frequency Limit for Maximum Voltage: 10 kHz
  • Dielectric: Polystyrene