Tube-number record
D.D./PEN
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BrandCOSSOR
ClassDouble Diode Pentode
Filament4 V @ 1 mA
Construction
Primary TypePentode
SectionsDouble Diode Pentode
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage200 V
Audio Performance
Key Features
- Variable-mu L.F. pentode
- Indirectly heated
- Corrected Automatic Volume Control
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 200 V | 2700 | — | — | — |
Application Notes
This valve is intended for corrected Automatic Volume Control, the gain being varied both in preceding stages and on the pentode portion. Care should be taken to use the values indicated in the instruction slip as variations of coupling will spoil the linearity of volume control.
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