Tube-number record
12AD5
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12AD5 is a tube type in the TubeDatabase archive (class: Remote Cut-off R.F. Pentode). Recorded specifications: brand Rogers Majestic Electronics, Ltd., construction Pentode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
BrandRogers Majestic Electronics, Ltd.
ClassRemote Cut-off R.F. Pentode
BaseNoval (B9A)
Filament12.6 V @ 100 mA
Construction
Primary TypePentode
EnvelopeT6-1/2
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage250 V
Cathode Current10 mA
H-C Voltage150 V
Audio Performance
Key Features
- Remote Cut-off
- Coated unipotential cathode
- Internal shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Sliding Grid No.2 Voltage (Rg2=40k, Rk=325) | 100 V | 1900 | 800000 | 18 | 3.3 mA |
| Sliding Grid No.2 Voltage (Rg2=40k, Rk=325) | 170 V | 2200 | 1000000 | 18 | 6 mA |
| Sliding Grid No.2 Voltage (Rg2=40k, Rk=325) | 200 V | 2300 | 1000000 | 18 | 7.2 mA |
| Fixed Grid No.2 Voltage (Rk=325) | 100 V | 2200 | 600000 | 18 | 6 mA |
Application Notes
Operating characteristics provided for sliding grid No.2 voltage and fixed grid No.2 voltage.
Datasheets
Datasheet: 12AD5.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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