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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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12DM5 vacuum tube outline illustration

Tube-number record

12DM5

0 archive entries

12DM5 is a tube type in the TubeDatabase archive (class: BEAM POWER PENTODE). Recorded specifications: brand TUNG-SOL, year 1957, construction Beam tetrode / beam power, socket Miniature 7-pin (B7G), maximum plate voltage 145 V, and maximum plate dissipation 5.45 W. The archive does not yet hold a photographed example of this type.

BrandTUNG-SOL
ClassBEAM POWER PENTODE
BaseMiniature 7-pin (B7G)
Filament12.6 V @ 0.45 mA

Construction

Primary TypeBeam tetrode / beam power
EnvelopeGLASS BULB
SectionsSINGLE

Filament / Heater

MaterialCOATED UNIPOTENTIAL CATHODE
Warm-up Time11s
Heater NotesAC OR DC

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
SINGLE-TUBE CLASS A1 AMPLIFIER110 V750014000—49 mA

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.

Filters

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Manufacturers

Brands

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    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