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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier (1)100V4800250000-8.2mA
Class A Amplifier (2)250V4200800000-10mA

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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