38HE7
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BrandGeneral Electric
ClassCompactron Diode-Pentode
BaseE12-74
Filament37.8V @ 450mA
Construction
Primary TypeDiode-Pentode
EnvelopeT-12
Base MaterialGlass
Sections2
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesHeater current tolerance ± 30 mA
Absolute Maximum Ratings
Plate Voltage1010 V
Plate Dissipation12 W
Grid 2 Voltage250 V
Grid 1 Voltage-55 V
Cathode Current230 mA
H-C Voltage200 V
Audio Performance
Key Features
- Compactron
- High-perveance diode
- Beam-power pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section - Cutoff Check | 5000V | - | - | - | 1mA |
| Pentode Section - Zero Bias High Current | 50V | - | - | - | 450mA |
| Pentode Section - Normal Operating Point | 130V | 8800 | 6200 | 4.2 | 60mA |
Application Notes
The diode is intended for service as the damping diode and the pentode as the horizontal-deflection amplifier in television receivers.
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