1214-D: Difference between revisions

From GRWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 32: Line 32:
==Links==
==Links==


* [[1214-AS2]] – electrically identical
* [[Media:GR Exp 1214-AS2 08_1956.pdf|Experimenter August 1956 describing Type 1214-AS2]]
* [[Media:GR Exp 1214-AS2 08_1956.pdf|Experimenter August 1956 describing Type 1214-AS2]]
* [[Media:GR Exp 1214-D 07_1958.pdf|Experimenter July 1958 describing Type 1214-D]]
* [[Media:GR Exp 1214-D 07_1958.pdf|Experimenter July 1958 describing Type 1214-D]]

Revision as of 06:57, 30 April 2024

General Radio 1214-D
Unit Oscillator
General Radio 1214-D Unit Oscillator

Available from 1959 to 1965

Manuals
Catalog History
 Document Year Page
Catalog P 1959 112
Catalog Q 1961 106
Catalog R 1963 110
Catalog S 1965 130
(All manuals in PDF format unless noted otherwise)

The General Radio 1214-D Unit Oscillator was introduced in Catalog P (1959) and remained available through Catalog S (1965).

The Type 1214-D is a unit oscillator specifically designed as a generator for the Type 1611-B Capacitance Test Bridge. It operates at 120 Hz, the recommended frequency for testing electrolytic capacitors.

The 1214-D output circuit uses two transformers, the first serving as a load for the oscillator tube, and the second acting as an adjustable match for the Type 1611-B bridge. A front-panel phone jack acts as an input to the matching transformer for an external oscillator.

A single 117N7 tube contains the power supply rectifier and a beam PA as the oscillator. A Thyrite element (varistor) is used in the 117N7 grid circuit to limit oscillator amplitude. Like other instruments in the 1214 family (1214-M, 1214-A, and 1214-E), the 1214-D's power supply is transformerless.

Specifications

  • Frequency: 120 cycles ±2%
  • Output Impedance: Four impedances to match the impedance of the Type 1611-B Capacitance Test Bridge at four multiplier positions
  • Output: At least 2000 mW into matched load
  • Distortion: Less than 3% into a matched load

Links

Photos