Tube-number record
5842 / 417A
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ClassTriode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypeTriode
EnvelopeT 6 1/2
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation4.5 W
Grid 1 Voltage-25 V
Cathode Current38 mA
H-C Voltage55 V
Audio Performance
Key Features
- Frame grid construction
- High transconductance
- Low noise
- Intermediate frequency application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 130 V | 27000 | 1600 | 44 | 27 mA |
| Class A1 | 150 V | 25000 | 1700 | 43 | 25 mA |
Application Notes
Operating characteristics of high transconductance tubes are sensitive to variations. The use of a 360 ohm cathode resistor in conjunction with a DC control grid return to a +9.0 volt supply is recommended to stabilize the operating point.
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