Tube-number record
1.P.10
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BrandMazda
ClassOutput Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current11 mA
Audio Performance
Typical THD11%
Power Output0.27 W
Key Features
- Directly heated
- Battery operation
- Centre tapped filament
- Tentative data
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Parallel Filament) | 67.5 V | 1400 | 100000 | — | 6.2 mA |
| Class A Amplifier (Parallel Filament) | 90 V | 1430 | 100000 | — | 7.8 mA |
| Class A Amplifier (Series Filament) | 67.5 V | 1550 | 200000 | — | 7.4 mA |
| Class A Amplifier (Series Filament) | 90 V | 1550 | 100000 | — | 7.4 mA |
Application Notes
For normal operation from a 1.4 volt dry cell the two sections are connected in parallel. For series operation, a shunting resistance must be placed across the 1.4V section nearest the negative end to by-pass cathode current.
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