Tube-number record
P.A.1
0 archive entries
P.A.1 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand BRIMAR, construction Triode, socket 5-pin, and maximum plate voltage 200 V. The archive does not yet hold a photographed example of this type.
BrandBRIMAR
ClassPower Triode
Base5-pin
Filament4 V @ 1000 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater Notes4.0 volts +/- 5%
Absolute Maximum Ratings
Plate Voltage200 V
Cathode Current50 mA
Audio Performance
Key Features
- Indirectly heated
- High sensitivity
- Moving coil speaker driver
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Measured at Eg=0 | 100 V | 12000 | 1050 | 12.6 | — |
| Typical Operation | 100 V | — | — | — | 23 mA |
| Typical Operation | 150 V | — | — | — | 35 mA |
| Typical Operation | 200 V | — | — | — | 40 mA |
Application Notes
Grid bias is most conveniently derived by including a resistance in the cathode lead of approximately 260 ohms. This should be shunted by a condenser of at least 4 mfd.
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