1390-B: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 12: | Line 12: | ||
* [[Media:GR 1390-B Random Noise Generator 11_1965.pdf|General Radio 1390-B Random Noise Generator Manual 1390-0100-K (1965)]] | * [[Media:GR 1390-B Random Noise Generator 11_1965.pdf|General Radio 1390-B Random Noise Generator Manual 1390-0100-K (1965)]] | ||
}} | }} | ||
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 Catalog78. | It first appears in [[Media:GRwiki Catalog Q OCR 1961.pdf|Catalog Q]] and remained available through Catalog78. | ||
Revision as of 07:00, 29 February 2024
The General Radio 1390-B is a random noise generator introduced in 1961. It first appears in Catalog Q and remained available through Catalog78. 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
-
-
-
-
-
-
-
Noise tube, V2, operating in magnetic field
