1214-A
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The General Radio 1214-A Unit Oscillator was introduced in Catalog M (1951) and remained available through Catalog S (1965).
The Type 1214-A is a member of the Unit Oscillator family that uses a self-contained power supply. It operates at two popular frequencies, 400 Hz as a modulation source and 1000 Hz for bridge generator service.
The single 117N7 tube contains the power supply rectifier and beam PA as the oscillator. A Thyrite element (varistor) is used in the 117N7 grid circuit to limit oscillator amplitude. Like others in 1214 family (1214-M, 1214-D, and 1214-E), the 1214-M uses a transformerless power supply.
Specifications
- Frequency: 400 and 1000 cycles, accurate to ±2%
- Output: The maximum output power is over 200 mW; output impedance ~8 kΩ with the (10 kΩ) output control at maximum; Open-circuit voltage ~80 V
- Distortion: Less than 3% into matching load
