Tube-number record
12R5
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BrandGeneral Electric
ClassPentode
BaseMiniature 7-pin (B7G)
Filament12.6 V @ 600 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-5 1/2
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesControlled heater warm-up characteristic for series-connected heaters.
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation4.5 W
Grid 2 Voltage150 V
Grid 1 Voltage-150 V
Cathode Current45 mA
H-C Voltage300 V
Audio Performance
Key Features
- Controlled heater warm-up
- High zero-bias plate current
- Miniature beam pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Vertical-Deflection Amplifier Characteristic 1 | 45 V | — | — | — | 120 mA |
| Vertical-Deflection Amplifier Characteristic 2 | 110 V | 7000 | 13000 | — | 40 mA |
Application Notes
Primarily designed for use as a pentode-connected vertical-deflection amplifier in television receivers.
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