Tube-number record
W42
0 archive entries
W42 is a tube type in the TubeDatabase archive (class: Variable Mu Screen Pentode). Recorded specifications: brand Osram, construction Pentode, base Bakelite, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandOsram
ClassVariable Mu Screen Pentode
Base7-pin (non-miniature)
Filament4 V @ 0.6 mA
Construction
Primary TypePentode
EnvelopeGlass (Carbonised)
Base MaterialBakelite
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated Cathode
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 250 V | 1500 | — | — | 7.6 mA |
| Variable Mu Range (Cut-off) | 250 V | 4.5 | — | — | — |
| Max Gain Condition | 250 V | 1750 | — | — | — |
Application Notes
The OSRAM W42 is suitable for use in a high frequency or intermediate frequency amplifier. Variable Mu characteristics enable volume control via grid bias voltage variation.
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