7X7
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BrandNational Union Radio Corporation
ClassTwin Diode - High Mu Triode
BaseLoctal
Filament7V @ 320mA
Construction
Primary TypeTwin Diode - High Mu Triode
EnvelopeT-9
Sections3
Filament / Heater
Heater NotesNominal ratings
Absolute Maximum Ratings
Plate Voltage300 V
Audio Performance
Key Features
- Coated Unipotential Cathodes
- Loctal 8-Pin Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Unit - Class A | 100V | 1400 | 61000 | 85 | 1.4mA |
| Triode Unit - Class A | 250V | 1500 | 67000 | 100 | 1.5mA |
Application Notes
Zero-bias Resistance Coupled Amplifier Class A operation supported.
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