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

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Tube-number record

D.V.S./PEN.

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D.V.S./PEN. is a tube type in the TubeDatabase archive (class: Variable Mu H.F. Pentode). Recorded specifications: brand Cossor, construction Pentode, socket 7-pin (non-miniature), and maximum plate voltage 200 V. The archive does not yet hold a photographed example of this type.

BrandCossor
ClassVariable Mu H.F. Pentode
Base7-pin (non-miniature)
Filament
16 V @ 250 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage200 V
Grid 2 Voltage100 V
Grid 1 Voltage-20 V

Audio Performance

Key Features
  • Variable-mu characteristic
  • Screened HF pentode
  • Independent suppressor grid (7-pin version)
  • Suppressor grid internally connected to cathode (5-pin version)

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Maximum Transconductance200 V3000———
Standard Operating Point200 V2000———

Application Notes

The suppressor grid being brought out to a separate pin in the 7-pin base allows for use in frequency changing or gain control. Negative potential on the suppressor grid decreases impedance and flattens tuning.

Filters

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