Tube-number record
QP21
0 archive entries
QP21 is a tube type in the TubeDatabase archive (class: Output Double Pentode). Recorded specifications: brand Osram, construction Pentode, socket 7-pin (non-miniature), and maximum plate voltage 150 V. The archive does not yet hold a photographed example of this type.
BrandOsram
ClassOutput Double Pentode
Base7-pin (non-miniature)
Construction
Primary TypePentode
EnvelopeGlass
SectionsDouble
Filament / Heater
MaterialOxide Coated
Absolute Maximum Ratings
Plate Voltage150 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Quiescent Push-Pull (150V) | 150 V | 2300 | — | — | 3.5 mA |
| Quiescent Push-Pull (120V) | 120 V | — | — | — | 2.8 mA |
Application Notes
Designed for the output stage of 2-volt battery receivers in which this stage directly follows the Detector. Standing anode current is restricted to a very small value and the actual high tension current is proportional to signal strength.
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