7H7
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BrandSylvania
ClassSemi-Remote Cut-off Pentode
BaseLock-In 8 Pin
Filament7V @ 320mA
Construction
Primary TypePentode
EnvelopeT9
SectionsSingle
Filament / Heater
Heater NotesNominal rating 7.0V/0.320A; Typical operation at 6.3V/0.300A
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 2 Voltage150 V
H-C Voltage90 V
Audio Performance
Key Features
- Semi-remote cut-off
- Lock-In construction
- Short leads for high-frequency circuits
- High mutual conductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (1) | 100V | 4800 | 250000 | - | 8.2mA |
| Class A Amplifier (2) | 250V | 4200 | 800000 | - | 10mA |
Application Notes
Suitable for RF or television service. Similar to Type 6AB7 except for lower heater current and slightly lower mutual conductance. High mutual conductance helps compensate for low gain in wide-band amplifier designs.
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