Tube-number record
7H7
0 archive entries
7H7 is a tube type in the TubeDatabase archive (class: Semi-Remote Cut-off Pentode). Recorded specifications: brand Sylvania, construction Pentode, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassSemi-Remote Cut-off Pentode
BaseLoctal
Filament7 V @ 320 mA
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (1) | 100 V | 4800 | 250000 | — | 8.2 mA |
| Class A Amplifier (2) | 250 V | 4200 | 800000 | — | 10 mA |
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.
Datasheets
Datasheet: 7H7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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