Tube-number record
12 QR 50
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12 QR 50 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube (Oscilloscope)). Recorded specifications: brand TESLA, construction Display / CRT, base Glass, socket Noval (B9A), and maximum plate voltage 4400 V. The archive does not yet hold a photographed example of this type.
BrandTESLA
ClassCathode Ray Tube (Oscilloscope)
BaseNoval (B9A)
Filament6.3 V @ 700 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialGlass
SectionsSymmetrical deflection
Filament / Heater
MaterialOxide-coated
Warm-up Time60s
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation 1 | 1500 V | — | — | — | — |
| Operation 2 | 3000 V | — | — | — | — |
| Operation 3 | 4000 V | — | — | — | — |
Application Notes
Used in high-requirement oscillographs. Requires electrostatic shielding with an aluminum cover and electromagnetic shielding with a soft magnetic material. A resistor of approximately 200 kOhms should be placed in the cathode lead for protection.
Datasheets
Datasheet: 12QR50.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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