12DM5
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BrandTUNG-SOL
ClassBEAM POWER PENTODE
Base7-PIN MINIATURE BUTTON
Filament12.6V @ 0.45mA
Construction
Primary TypeBEAM POWER PENTODE
EnvelopeGLASS BULB
SectionsSINGLE
Filament / Heater
MaterialCOATED UNIPOTENTIAL CATHODE
Warm-up Time11s
Heater NotesAC OR DC
Absolute Maximum Ratings
Plate Voltage145 V
Plate Dissipation5.45 W
Grid 2 Voltage117 V
H-C Voltage200 V
Audio Performance
Typical THD9%
Power Output1.9 W
Key Features
- CONTROLLED HEATER WARM-UP CYCLE
- TELEVISION RECEIVER AUDIO OUTPUT
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| SINGLE-TUBE CLASS A1 AMPLIFIER | 110V | 7500 | 14000 | - | 49mA |
Application Notes
Thermal characteristics of the heater are controlled such that heater voltage surges during the warm-up cycle are minimized provided it is used with other types which are similarly controlled.
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