Tube-number record
D.V.S./PEN.
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BrandCossor
ClassVariable Mu H.F. Pentode
Base7-pin (non-miniature)
Filament16 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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Maximum Transconductance | 200 V | 3000 | — | — | — |
| Standard Operating Point | 200 V | 2000 | — | — | — |
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.
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