4EJ7/YF184
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BrandAmperex
ClassSharp cut-off pentode
BaseE9-1
Filament4.4V @ 450mA
Construction
Primary TypePentode
EnvelopeT6 1/2
SectionsSingle
Filament / Heater
Heater Notes450 mA controlled warm-up series string operation
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Grid 1 Voltage50 V
Cathode Current25 mA
H-C Voltage150 V
Audio Performance
Key Features
- Frame grid
- Sharp cut-off
- High transconductance
- Low interelectrode capacitance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| IF Amplifier | 200V | 15000 | 350000 | 60 | 10mA |
Application Notes
The 4EJ7/YF184 is a frame grid sharp cut-off pentode designed for use as an IF amplifier in television receivers. It should not be used in circuits with automatic gain control; a variable amplification factor tube is recommended for such applications.
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