Tube-number record
404A
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ClassRF AMPLIFIER PENTODE
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeT6-1/2
Sectionssingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation3.3 W
Grid 2 Voltage165 V
Grid 1 Voltage-25 V
Cathode Current40 mA
H-C Voltage55 V
Audio Performance
Key Features
- Frame grid
- High transconductance
- Low noise
- Low inter-electrode capacitances
- Broadband qualities
- Freedom from microphonics
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 150 V | 13000 | 2000000 | — | 13.5 mA |
| Class A1 (Fixed + Cathode Bias) | 160 V | 13000 | 2000000 | — | 13.5 mA |
Application Notes
Intended for use up to ultrahigh frequencies. The frame grid provides high broadband qualities and freedom from microphonics. Use of a 600 ohm cathode resistance in conjunction with a DC control grid return to a +8.5 volt supply is recommended to sensitivity to variations.
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