1390-B: Difference between revisions
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The '''General Radio 1390-B''' is a random noise generator introduced in 1961. | The '''General Radio 1390-B''' is a random noise generator introduced in 1961. | ||
It first appears in [[Media:GRwiki Catalog Q OCR 1961.pdf|Catalog Q]] and remained available through | It first appears in [[Media:GRwiki Catalog Q OCR 1961.pdf|Catalog Q]] and remained available through Catalog 1978. | ||
The Type 1390-B provides random noise on three ranges from 20 kHz to 5 MHz. | The Type 1390-B provides random noise on three ranges from 20 kHz to 5 MHz. | ||
It produces electrical noise using a [[6D4]] gas-discharge tube, V2, operated in the field of a permanent magnet. | It produces electrical noise using a [[6D4]] gas-discharge tube, V2, operated in the field of a permanent magnet. | ||
Revision as of 21:05, 7 March 2024
The General Radio 1390-B is a random noise generator introduced in 1961. It first appears in Catalog Q and remained available through Catalog 1978.
The Type 1390-B provides random noise on three ranges from 20 kHz to 5 MHz. It produces electrical noise using a 6D4 gas-discharge tube, V2, operated in the field of a permanent magnet. The noisy plate voltage of the 6D4 tube drives two stages of amplification. Between the amplifier stages, filter networks shape the three bands. A voltmeter displays RMS voltage then of the noise signal before it is fed to a five position decade attenuator at the output.
Specifications
- Frequency Range: 5 Hz to 5 MHz in three bands.
- Output Voltage: 3 V for 20 kHz range, 2 V for 500 kHz range, and 1 V for 5 MHz range.
- Output Impedance: 900 Ω
- Output Attenuator: 1, .1, .01, .001, and .0001 times the RMS Voltmeter reading.
Links
Photos
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Noise tube, V2, operating in magnetic field
