Tube-number record
3EJ7/XF184
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BrandAmperex
ClassSharp cut-off pentode
BaseNoval (B9A)
Filament3.4 V @ 0.6 mA
Construction
Primary TypePentode
EnvelopeT6 1/2
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater Notes600 mA controlled warm-up series string operation
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-50 V
Cathode Current25 mA
H-C Voltage150 V
Audio Performance
Key Features
- Frame grid
- High transconductance
- Low interelectrode capacitance
- Simplified broad band amplifier construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| IF Amplifier | 200 V | 15000 | 350000 | 60 | 10 mA |
Application Notes
Operation with cathode bias resistor is recommended. Should not be used in circuits with automatic gain control; for such applications a tube with a variable amplification factor is recommended.
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